• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Radiation effects of electrons on multilayer FePS3 studied with laser plasma accelerator

    2022-08-31 09:57:48MengPeng彭猛JunBoYang楊俊波HaoChen陳浩BoYuanLi李博源XuLeiGe葛緒雷XiaoHuYang楊曉虎GuoBoZhang張國博andYanYunMa馬燕云
    Chinese Physics B 2022年8期
    關(guān)鍵詞:陳浩楊俊

    Meng Peng(彭猛) Jun-Bo Yang(楊俊波) Hao Chen(陳浩) Bo-Yuan Li(李博源)Xu-Lei Ge(葛緒雷) Xiao-Hu Yang(楊曉虎) Guo-Bo Zhang(張國博) and Yan-Yun Ma(馬燕云)

    1Department of Physics,National University of Defense Technology,Changsha 410072,China

    2College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 518000,China

    3Key Laboratory for Laser Plasmas(MoE),School of Physics and Astronomy,Shanghai Jiao Tong University,Shanghai 200240,China

    4College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China

    Keywords: space radiation,laser–plasma interaction,two-dimensional material,Raman spectroscopy

    1. Introduction

    Space radiation is one of the substantial threats to spacecraft and satellites because it can severely damage solar cells and electronics onboard.[1]With the continuous deepening of human space exploration, the demands on spacecraft performance are increasing. All space agencies around the world are constantly developing various countermeasures to deal with this threat. Space radiation, which has a plenitude of different types and origins,can be extremely versatile. Space radiation is usually composed of various particles, such as electrons,protons,ions,and photons. Moreover,the energy spectra of radiation belt are very broadband,spanning multiple orders of magnitude.[1,2]Space radiation belts exist in the five strongly magnetized planets in solar system, namely, Earth,Jupiter, Saturn, Uranus, and Neptune.[3–5]According to the model based on the measurements of Pioneer and Voyager detections, the electron energy in Jupiter’s radiation belt can reach 100 MeV,which is much higher than that in Earth’s radiation belt.[5–8]

    In planetary radiation belts, energetic electrons are accelerated to form directional spectra fluxes characterized by a power-law or exponential decline towards higher energies.In contrast to space radiation,laboratory’s space radiation test facilities characterized by linacs or cyclotrons cannot produce broadband spectra, but instead monoenergetic beams,resulting in completely different energy deposition on the device.[9]Based on the chirped pulse amplification(CPA),[10]today’s laser system can generate power up to petawattregime to produce relativistic electron beam by laser–plasma interaction.[11,12]Electron beams with low energy divergence and exponential energy distribution emitted from laser-plasma accelerator (LPA) are similar to the conditions in space radiation, contributing to a booming research field, especially in the field of space radiation.[2,8,12]LPA is a workable advanced tool as a complementary source for space radiation testing. In 2017, Hiddinget al.[2]used LPA to reproduce the broadband Van-Allen belt level electron beam for systematically exploring the degradation of optocouplers,and a significant electronics degradation characterized straightforwardly by the current transfer ratio was acquired with such laboratory-made space radiation.

    The harsh radiation environment has a severe impact on the reliability of conventional silicon-based devices. The undesirable phenomena such as single event effect, total dose effect, and displacement damage, can adversely affect their performance.[13–16]Now, quantum tunneling is setting a hard limit for further miniaturization of silicon-based electronics at nanoscale technology nodes, but the adoption of novel material and/or device structure is considered beyond this limit. Of particular interest is the two-dimensional (2D) material such as graphene,[17–20]transition metal dichalcogenide(TMD),[21–23]and black phosphorus(BP).[24–26]Their intrinsically large specific area,low power requirement,and chemical stability make devices based on 2D material a promising candidate for space instrumentation.[14]The 2D materialbased integrated electronics have a smaller sensitive volume, demonstrating stronger protection against single event effects.[27]However, zero bandgap limits the application of graphene in the field of optoelectronics.[17,18]BP(0.3 eV)and TMD(<2.0 eV)have a small bandgap that hinders the potential optoelectronic application at higher energy. Recently, 2D layered metal phosphorus trichalcogenides (MPS3,M=Fe,Ni, Mn, Zn, etc.)[28–31]have received enormous attention for the excellent electronic, optical and magnetic properties derived from their electronic structure and energy band. In this article, we study the exponential energy electron beam produced by LPA for the 2D material(FePS3)testing,which has potential space application. A series of characterizations have been performed on the FePS3sample before and after electron radiation for radiation damage analysis, and the detailed discussion and conclusion are given in Section 3.

    2. Experimental details

    2.1. Preparation and characterization of FePS3

    Fig.1. (a)Schematic crystal structure of FePS3. (b)Brightfield microscope image of cleaved sheet samples exfoliated onto an oxidized silicon substrate.(c)AFM topography image of FePS3 sample,and the height profiles along line A.(d)The typical Raman spectrum of FePS3 sample showing Eu,E(3)1g,A(11g),E(14g),A(12g),Si-2TA,and Si-TO peaks.

    An optical microscope (BX41M-LED, Olympus) has been used to characterize the FePS3samples. In the case of exfoliated FePS3samples, the region edges and boundaries between different layers often run in parallel or are arranged at angles close to 60?and 120?[34](see Fig. 1(b)).This observation is due to the crack-propagation along the crystal axis of high-symmetry during exfoliation. The FePS3samples comprising areas of tens of layers with 2–20 μm lateral dimensions have been scanned by the atomic force microscopy (AFM, NT-MDT Solver SPM &SNOM). Figure 1(c) presents the AFM topography image along height profiles. Raman spectroscopy (Senterra, Bruker), as a nondestructive characterization technique, has been used to test the property of FePS3at room temperature. According to

    2.2. Electron radiation

    In 1979, laser electron acceleration was proposed by Tajima and Dawson.[40]In their theory, when an intense focused laser pulse(I ≥1018W/cm2)propagates through the underdense plasma, this plasma will excite a relativistic plasma wave with a field amplitude of 100 GV/m. This plasma wave passes through the plasma at the same speed of laser.[12,41]Massive charge displacements cause a high electric wake-field for electron acceleration to relativistic energy in a very short distance. The radiation damage experiment has been performed with a compact state-of-the-art Ti:sapphire laser system at Shanghai Jiao Tong University.[42]Here,the laser pulse with an energy ofE ~5.8 J was delivered in 29 fs over a 30μm diameter focus. The laser was focused on a gas-jet target by off-axis parabola (OAP) where the gas-jet ejected the mixed gas (0.5% N2+99.5% He) at each shot to produce a broadband electron beam by self-truncated ionization injection.[42]The whole experimental process was carried out in a vacuum chamber,as described in Fig.2.

    Fig.2. The setup of the radiation chamber for online monitoring electron beam. The indent laser system was strongly focused on the gas jet by OAP where the radiation was produced. Focus diagnostic microscope objective(2D stage),permanent magnet-based spectrometer,IP,and DRZ in the forward direction were positioned next to the gas jet.

    An infrared camera(CCD1, Spiricon OPHIR Photonics)and 2D stage were used to monitor dynamically the focused laser spot when adjusting the laser path to maximize the laser intensity on the gas jet. The top-view image of plasma channel formed by laser–plasma interaction was captured by a 12-bit CCD camera (CCD2, Pixelfly). The electron beam was recorded by the magnetic spectrometer which consists of a permanent dipole magnet,an Image Stack(IP,Fusji),a scintillator screen (DRZ, Mitsubishi Chemical), and an intensified charge-coupled device (ICCD, Andor) camera. The dipole magnet was 16 cm long, 1.0 T magnetic field strength with a 1 cm gap. The direction of magnetic field in the gap was perpendicular to its horizontal plane during installation. The distance between the exit of dipole magnet and the IP was 16.5 cm, which fully resolves the peak electron energy up to~400 MeV.The energetic electron flux could penetrate the IP to image on the DRZ,and then the fluorescence signals emitted from DRZ were recorded by ICCD online. A cumulative electron signals with 5 shots in IP are presented in Fig. 3(a).Based on the gyroradius of the electron trajectory in dipole magnet and electron signals recorded by IP, an average electron number of 1.2×107per shot is produced. The fluence of LPA-produced electron beam per shot is approximately equivalent to the electron beams with energies greater than 0.2 MeV in Earth’s radiation belt. The broadband electron spectrum is depicted in Fig.3(b)(black line).

    In order to make FePS3samples with cross-section of about 1×1 cm fully irradiated by an electron beam with a few milliradian divergence,an 8 mm thick aluminum foil has been used to enlarge the electron beam spot. Meanwhile, an InSe film has been used to monitor the uniformity and spot size of the electron beam,while the magnetic spectrometer and DRZ were positioned in the front of FePS3sample for dynamic monitoring electron beam.The schematic diagram of radiation test is depicted in Fig. 4(a), where the accumulated electron beams with 3 shots were irradiated on the FePS3samples. The transportation process of energetic electron beam in aluminum foil has been simulated with Geant4 (Version 4.10.7).[43,44]The“FTFP BERTGE”physics package was used to describe the transportation of energetic electrons and secondary particles. It was assumed that a plane particle source of 1 mm radius,50 milliradian divergence degree shot electrons to aluminum foil after 50 cm flight in vacuum. Based on the simulation results,the spot radius of the outgoing electron beam was expanded to 5 mm, fully covering the surface of testing samples(see Fig.4(b)).The simulated outgoing electron spectrum is presented in Fig.3(b)(red line).

    The energetic electron beams produced by LPA are well beyond the energy limit of Earth’s radiation belt where the majority of electrons have energies up to 15 MeV. However, it shall be pointed out that the most important aspect is the exponential electron spectrum produced by LPA.[12]Moreover, based on the simulation results, the deposited energies to FePS3sample via electron–nucleus scattering are rather constant for electron energy range above 3 MeV (see Fig. 5). The total absorbed dose of FePS3sample irradiated by LPA-produced electron beams is about 1.2 mGy, which is 10% higher than that produced by electron beams at geosynchronous orbit at the same electron intensity.

    Fig.3. The exponential electron beam produced from LPA.(a)The raw information of electron beams obtained by IP. (b) The induced broadband electron spectra before (black line, the experimental result) and after(red line,the simulated result)passing through Al foil.

    Fig.4. (a)Schematic diagram of the electron beam for radiation test. (b)The spot size of electron flux after propagating Al foil.

    Fig. 5. The simulated results of deposited energy for electron energy from 3 MeV to 400 MeV in the FePS3 sheet sample.

    3. Results and discussion

    Electron stopping is mainly controlled by inelastic scattering between the incoming energetic electron beam and the electrons in the target.[45]Inelastic scattering can excite target electrons to relatively high energy(keV),which can transfer electron excitation energy away from the central region of the lattice, causing damage far away from the collision region. When the transferred energy is large enough to exceed the threshold for target atom displacing from lattice position,it causes to ionization and bond breakage. Once electron beams transfer enough energy, or numerous inelastic scatterings occur close to each other, the cascade process develops into a complex multi-body phenomenon,leading to the lattice breakup. The region of overlapping collisions can be regarded as “hot”, called a “heat spike”,[46–48]which may lead to intense heating of crystal lattice and damage to the cylindrical heat spikes.[49]Near the sample surface, the heat spike can lead to massive sputtering evaporation.[50]The optical image of InSe film exposed to the energetic electron beam is presented in Fig. 6(a). There are significantly light spots corresponding to the thinner area formed from the massive evaporation,whereas the optical characteristics of InSe film also indicate that the electron flux uniformity was good after propagating Al foil. The energies transferred to the FePS3sample were much larger than the bond energy and Van Der Waals gap,causing the bond to broke and massive particle evaporation.As a result,electron radiation led to bulk sample cleavage and damage between areas of uneven thickness (see Figs. 6(b)–6(c)).

    The energy of electron beam far exceeds the threshold for knock-on damage,and hole formation to the crystal lattice can be initiated at energy as low as tens of keV.[51]The optical image of sheet sample after electron radiation is presented in Fig. 7(a). It has numerous cyan holes on the FePS3surface caused by electron sputtering. The electron radiation effect on the surface topography of FePS3was also characterized with AFM at ambient temperature,while the surface image and the height information of multilayer FePS3sample following radiation are shown in Figs.7(b)–7(c). The thin sheet sample has smaller average roughness (Ra) than the thick sample, which is ascribed to more average energy acquired by sample target atoms during radiation and impurities on the surface. During the preparation of sheet samples, H2O and O2molecules adhere inevitably to the sample surface. Electron radiation breaks the structure of [P2S6]4?, and the dangling bonds of S and P can combine H2O and O2molecules to form S=O and P=O bonds.

    Fig.6. (a)Optical image of InSe with obvious light spots after radiation. (b)Optical image of bulk FePS3 sample before radiation. (c) The electron-induced cleavage of bulk FePS3 sample after radiation.

    Fig. 7. (a) Brightfield microscope image of sheet samples after electron radiation. (b) AFM surface topography of FePS3 sheets following energetic electron radiation. (c)The cross-sectional height along line A in(b).

    Fig. 8. The Raman spectra of FePS3 sample before and after electron radiation. (a) Out-of-plane vibration: Eu mode. (b) Out-of-plane vibration: A(11g) mode and in-plane vibration: E(14g) mode. (c)Out-of-plane vibration: A(12g) mode.

    4. Conclusion

    In combination with the established conventional radiation source, LPA, as a complementary radiation source, can allow us to reproduce space radiation for electronic tests. In this work, a compact state-of-the-art Ti:sapphire laser system at a laser intensity ofI=2.8×1019W/cm2has been used to produce broadband electron beams for studying space radiation effects on the 2D material. In this experiment of laserplasma interaction,we have produced an exponential energetic electron beam with an average intensity of 1.4×107/shot.

    The effects of electron beam radiation on tens of layers FePS3samples have been systematically investigated with different kinds of characterization tools. Electron radiation led to the bulk sample cleavage and damage between areas of uneven thickness, while the energetic electron beam caused massive sputtering and ablation of the FePS3sheet sample, resulting in the surface of FePS3samples rough dramatically. Electron radiation also caused severe damage on the bipyramid structure of[P2S6]4?unit and the cleavage of P–P and P–S bonds,resulting in all the characteristic peaks sharply weakened to some extent, or even disappearing. It has a radiation threshold on the 2D material and device for normal operation under such harsh electron radiation. Our results pave the way towards testing the property of 2D materials under intense radiation and the allowable radiation dose for the application of 2D material and device.

    Acknowledgements

    Project supported by the National Natural Science Foundation of China (Grant No. 11975308), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA25050200), and Science Challenge Project (Grant No.TZ2018001).

    猜你喜歡
    陳浩楊俊
    Topological states switching and group velocity control in two-dimensional non-reciprocal Hermitian photonic lattice
    楊俊德:農(nóng)業(yè)豐收的“守護神”
    CONSTRUCTION OF IMPROVED BRANCHING LATIN HYPERCUBE DESIGNS?
    Investigation of hypersonic flows through a cavity with sweepback angle in near space using the DSMC method*
    DYNAMICS ANALYSIS OF A DELAYED HIV INFECTION MODEL WITH CTL IMMUNE RESPONSE AND ANTIBODY IMMUNE RESPONSE?
    陳浩悼亡詩淺析附《楚帆集》校語
    李泊城 隋邦平 楊俊顯 王綠竹 作品
    大眾文藝(2019年3期)2019-01-24 13:39:44
    《紅蜻蜓》教案
    Current Reversals of an Underdamped Brownian Particle in an Asymmetric Deformable Potential?
    醉你
    国产免费一区二区三区四区乱码| 在线观看人妻少妇| 另类亚洲欧美激情| 亚洲av中文av极速乱| xxx大片免费视频| 精品少妇内射三级| 亚洲图色成人| av福利片在线观看| 精品国产乱码久久久久久小说| 亚洲精品国产成人久久av| 一级毛片我不卡| 午夜精品国产一区二区电影| 亚洲经典国产精华液单| 女人精品久久久久毛片| 亚洲av免费高清在线观看| 久热久热在线精品观看| 日本黄色日本黄色录像| 99热国产这里只有精品6| 综合色丁香网| 中文字幕制服av| 人妻一区二区av| 日韩av在线免费看完整版不卡| 日韩av免费高清视频| 国产精品久久久久成人av| 97在线人人人人妻| 夫妻性生交免费视频一级片| 色吧在线观看| 国产精品嫩草影院av在线观看| 精品亚洲成国产av| 国产成人精品无人区| 丰满人妻一区二区三区视频av| 精品卡一卡二卡四卡免费| 国产爽快片一区二区三区| 在线播放无遮挡| 久久热精品热| 日韩强制内射视频| 欧美丝袜亚洲另类| 亚洲中文av在线| 婷婷色综合大香蕉| 精品少妇内射三级| 少妇精品久久久久久久| 男的添女的下面高潮视频| 亚洲国产欧美在线一区| 热99国产精品久久久久久7| 精品人妻一区二区三区麻豆| 制服丝袜香蕉在线| 国产亚洲午夜精品一区二区久久| 少妇熟女欧美另类| 免费看不卡的av| 亚洲精品视频女| 欧美另类一区| 少妇人妻精品综合一区二区| 亚洲,欧美,日韩| av在线观看视频网站免费| a级毛片免费高清观看在线播放| 国产精品久久久久久精品电影小说| 成人美女网站在线观看视频| 日韩av不卡免费在线播放| 色哟哟·www| 精品人妻熟女av久视频| 国产午夜精品一二区理论片| 欧美日韩在线观看h| 欧美性感艳星| 中文字幕制服av| 伦理电影大哥的女人| 欧美bdsm另类| 国语对白做爰xxxⅹ性视频网站| 亚洲国产精品国产精品| 国产免费福利视频在线观看| 男女国产视频网站| 一级av片app| 99国产精品免费福利视频| 国产一区二区三区av在线| 天堂8中文在线网| 欧美3d第一页| h日本视频在线播放| 搡女人真爽免费视频火全软件| 久久国产亚洲av麻豆专区| 黑人巨大精品欧美一区二区蜜桃 | 精品亚洲成国产av| 欧美精品一区二区大全| 亚洲情色 制服丝袜| 秋霞在线观看毛片| 色5月婷婷丁香| 街头女战士在线观看网站| 日韩成人av中文字幕在线观看| 亚洲精品中文字幕在线视频 | 午夜激情久久久久久久| 狂野欧美激情性bbbbbb| 国产成人freesex在线| 美女主播在线视频| 插阴视频在线观看视频| 夜夜爽夜夜爽视频| 日产精品乱码卡一卡2卡三| 99九九线精品视频在线观看视频| 精品99又大又爽又粗少妇毛片| 性高湖久久久久久久久免费观看| 各种免费的搞黄视频| 五月天丁香电影| 国产欧美日韩精品一区二区| 欧美精品一区二区免费开放| 在线观看免费高清a一片| 欧美成人精品欧美一级黄| 精品酒店卫生间| 国产一区二区在线观看av| 美女cb高潮喷水在线观看| 成人美女网站在线观看视频| 亚洲精品久久久久久婷婷小说| 18禁在线播放成人免费| 高清在线视频一区二区三区| 纵有疾风起免费观看全集完整版| 天美传媒精品一区二区| 观看免费一级毛片| 日本黄大片高清| 精品久久久久久久久av| av在线播放精品| 国产精品国产三级国产专区5o| 久久久a久久爽久久v久久| 久久久久久久久久成人| 久久久久久久久大av| 久久国内精品自在自线图片| 久久毛片免费看一区二区三区| 91aial.com中文字幕在线观看| 在线观看免费高清a一片| 在线观看人妻少妇| 国产亚洲5aaaaa淫片| 天美传媒精品一区二区| 亚洲av成人精品一区久久| 美女大奶头黄色视频| 伦理电影免费视频| 国产欧美日韩一区二区三区在线 | 久久久久视频综合| 韩国高清视频一区二区三区| 成人免费观看视频高清| 亚洲自偷自拍三级| 韩国高清视频一区二区三区| 熟女电影av网| 久久综合国产亚洲精品| 成年av动漫网址| 国产精品久久久久久久电影| 一级毛片久久久久久久久女| 免费黄网站久久成人精品| av.在线天堂| 久久久精品94久久精品| 蜜桃久久精品国产亚洲av| 免费观看在线日韩| 天堂8中文在线网| 久久精品国产鲁丝片午夜精品| 亚洲av日韩在线播放| 久久影院123| 高清毛片免费看| 制服丝袜香蕉在线| 国精品久久久久久国模美| 97在线人人人人妻| 黄片无遮挡物在线观看| 亚洲av免费高清在线观看| 在线播放无遮挡| 亚洲欧美成人综合另类久久久| 春色校园在线视频观看| 高清视频免费观看一区二区| 99久久中文字幕三级久久日本| 亚洲欧美中文字幕日韩二区| 国产成人freesex在线| 日韩大片免费观看网站| 亚洲精品中文字幕在线视频 | 啦啦啦视频在线资源免费观看| videos熟女内射| 男的添女的下面高潮视频| 久久久久久久精品精品| 国产免费又黄又爽又色| 久久精品久久久久久噜噜老黄| 亚洲精品国产av成人精品| 久久毛片免费看一区二区三区| 久久精品国产自在天天线| 亚洲精品国产av成人精品| 18+在线观看网站| 搡女人真爽免费视频火全软件| 国产片特级美女逼逼视频| 国产成人一区二区在线| 亚州av有码| 麻豆乱淫一区二区| 欧美三级亚洲精品| 免费观看性生交大片5| 91成人精品电影| 亚洲av国产av综合av卡| 午夜福利影视在线免费观看| 内射极品少妇av片p| 一级毛片 在线播放| 最近的中文字幕免费完整| 黄色配什么色好看| 国产亚洲欧美精品永久| 乱人伦中国视频| 国产永久视频网站| 国产成人a∨麻豆精品| 男人添女人高潮全过程视频| 人人妻人人澡人人看| 久久久久网色| 老司机影院毛片| 精品一区在线观看国产| 观看免费一级毛片| 国产欧美日韩综合在线一区二区 | 色网站视频免费| 亚洲精品国产成人久久av| 久久精品国产亚洲av天美| 久久热精品热| 大香蕉97超碰在线| 国产黄片美女视频| 综合色丁香网| 人人妻人人看人人澡| 亚洲av成人精品一二三区| 欧美日韩av久久| 国产在线免费精品| 成人18禁高潮啪啪吃奶动态图 | 另类亚洲欧美激情| 日韩中文字幕视频在线看片| 性色av一级| 国产熟女欧美一区二区| 亚洲色图综合在线观看| 少妇被粗大的猛进出69影院 | 九九在线视频观看精品| av在线播放精品| 亚洲丝袜综合中文字幕| 国产成人免费观看mmmm| 亚洲国产成人一精品久久久| a级毛片在线看网站| av国产久精品久网站免费入址| 蜜桃在线观看..| av免费在线看不卡| 纯流量卡能插随身wifi吗| 国产免费一级a男人的天堂| 啦啦啦中文免费视频观看日本| 国产色婷婷99| 亚洲国产精品专区欧美| 黑人巨大精品欧美一区二区蜜桃 | 三级国产精品欧美在线观看| av卡一久久| 在线播放无遮挡| 97超视频在线观看视频| 性色av一级| 高清黄色对白视频在线免费看 | 亚洲精品aⅴ在线观看| 久久97久久精品| 国产成人精品一,二区| 美女主播在线视频| 欧美3d第一页| 边亲边吃奶的免费视频| 久久国产亚洲av麻豆专区| 午夜免费男女啪啪视频观看| 国产亚洲91精品色在线| 丝袜在线中文字幕| 亚洲精品乱码久久久久久按摩| 大片免费播放器 马上看| 国产精品人妻久久久久久| 日韩大片免费观看网站| 精品亚洲乱码少妇综合久久| 精品久久久久久久久亚洲| 亚洲欧美中文字幕日韩二区| 制服丝袜香蕉在线| 最近手机中文字幕大全| 久久女婷五月综合色啪小说| 免费观看性生交大片5| 人妻 亚洲 视频| 桃花免费在线播放| 老熟女久久久| 一区在线观看完整版| 最近的中文字幕免费完整| 国产精品久久久久久久电影| 国模一区二区三区四区视频| 人人妻人人澡人人爽人人夜夜| 国产综合精华液| 国产伦精品一区二区三区四那| 99久久精品热视频| 九九爱精品视频在线观看| 国产黄频视频在线观看| 51国产日韩欧美| 全区人妻精品视频| 18禁在线无遮挡免费观看视频| 国产成人一区二区在线| 色哟哟·www| av在线老鸭窝| 国产精品国产三级国产av玫瑰| 亚洲国产欧美日韩在线播放 | 丝袜在线中文字幕| 欧美精品一区二区免费开放| 国产精品一二三区在线看| 两个人的视频大全免费| 春色校园在线视频观看| 在线天堂最新版资源| 久久精品久久精品一区二区三区| 亚洲第一av免费看| 国产一区二区在线观看av| 香蕉精品网在线| 我的老师免费观看完整版| 亚洲高清免费不卡视频| 少妇高潮的动态图| 天堂8中文在线网| 99热这里只有是精品50| 99久久精品热视频| 亚洲国产精品成人久久小说| 一级毛片黄色毛片免费观看视频| 91久久精品国产一区二区成人| 久久av网站| 日本猛色少妇xxxxx猛交久久| 精品亚洲成国产av| 日韩大片免费观看网站| 久久久国产欧美日韩av| 99久久中文字幕三级久久日本| 蜜桃久久精品国产亚洲av| 国产 一区精品| 秋霞在线观看毛片| 国产精品国产三级专区第一集| 简卡轻食公司| 中文天堂在线官网| 国产淫片久久久久久久久| 美女脱内裤让男人舔精品视频| 91久久精品国产一区二区成人| 高清视频免费观看一区二区| 色视频在线一区二区三区| 欧美变态另类bdsm刘玥| 97在线视频观看| 夜夜爽夜夜爽视频| 亚洲精品乱久久久久久| 国产日韩欧美在线精品| 777米奇影视久久| 免费黄频网站在线观看国产| 国产真实伦视频高清在线观看| 国产美女午夜福利| 91久久精品电影网| 乱系列少妇在线播放| 成年美女黄网站色视频大全免费 | av黄色大香蕉| 99久久中文字幕三级久久日本| 美女视频免费永久观看网站| 成年美女黄网站色视频大全免费 | 国产中年淑女户外野战色| 99热这里只有是精品50| 国产黄色免费在线视频| 日日爽夜夜爽网站| 国产高清三级在线| 蜜臀久久99精品久久宅男| 中文字幕av电影在线播放| 欧美 日韩 精品 国产| 人妻夜夜爽99麻豆av| 狂野欧美激情性xxxx在线观看| 免费在线观看成人毛片| h日本视频在线播放| 少妇的逼好多水| 日本黄色片子视频| 欧美区成人在线视频| 男女国产视频网站| 内地一区二区视频在线| 两个人的视频大全免费| 美女xxoo啪啪120秒动态图| 国产日韩欧美亚洲二区| 日韩制服骚丝袜av| av在线app专区| 亚洲av男天堂| 一级爰片在线观看| 国产一区亚洲一区在线观看| 日韩精品免费视频一区二区三区 | 国产成人精品无人区| 男人和女人高潮做爰伦理| 免费观看av网站的网址| 日本欧美国产在线视频| 国产免费一级a男人的天堂| 女性被躁到高潮视频| 欧美三级亚洲精品| 人妻少妇偷人精品九色| 亚洲精品亚洲一区二区| 欧美3d第一页| 最新中文字幕久久久久| 涩涩av久久男人的天堂| 桃花免费在线播放| 欧美97在线视频| 少妇的逼好多水| 精品一品国产午夜福利视频| 欧美少妇被猛烈插入视频| 成人午夜精彩视频在线观看| 成人18禁高潮啪啪吃奶动态图 | 国产av码专区亚洲av| 日韩欧美精品免费久久| 美女脱内裤让男人舔精品视频| 亚洲va在线va天堂va国产| 欧美三级亚洲精品| av女优亚洲男人天堂| 纵有疾风起免费观看全集完整版| 久久久久国产精品人妻一区二区| 街头女战士在线观看网站| 免费看日本二区| 3wmmmm亚洲av在线观看| 久久精品国产鲁丝片午夜精品| 国产成人91sexporn| 久久久国产欧美日韩av| 有码 亚洲区| 国产精品国产av在线观看| av天堂久久9| 国产成人一区二区在线| 久久国产亚洲av麻豆专区| 黄色日韩在线| 亚洲欧美清纯卡通| 久久久久久久久久久久大奶| 日本黄色片子视频| 人人妻人人澡人人看| 十八禁高潮呻吟视频 | 国产成人午夜福利电影在线观看| 午夜免费鲁丝| 性高湖久久久久久久久免费观看| 岛国毛片在线播放| 亚洲高清免费不卡视频| av.在线天堂| 男人爽女人下面视频在线观看| 欧美精品人与动牲交sv欧美| 亚洲人与动物交配视频| av播播在线观看一区| 特大巨黑吊av在线直播| 99热网站在线观看| 国产免费又黄又爽又色| 少妇的逼好多水| 免费看不卡的av| 色视频在线一区二区三区| 国产精品一区二区三区四区免费观看| 亚洲va在线va天堂va国产| 在线看a的网站| 丝袜脚勾引网站| 婷婷色麻豆天堂久久| 国产69精品久久久久777片| 成人黄色视频免费在线看| 自线自在国产av| 中国三级夫妇交换| 赤兔流量卡办理| 观看美女的网站| 女人久久www免费人成看片| 人妻人人澡人人爽人人| 国产免费一级a男人的天堂| 亚洲精品第二区| 国产精品福利在线免费观看| 亚洲人与动物交配视频| 我的老师免费观看完整版| 国产成人aa在线观看| 亚洲av欧美aⅴ国产| 国产精品久久久久成人av| 久久国产精品大桥未久av | 只有这里有精品99| 亚洲不卡免费看| 国产精品人妻久久久影院| 少妇的逼水好多| 色视频在线一区二区三区| 黄色日韩在线| 丝袜脚勾引网站| 国产精品福利在线免费观看| 高清毛片免费看| 国产精品人妻久久久影院| 久久毛片免费看一区二区三区| 亚洲精品久久午夜乱码| 99视频精品全部免费 在线| av女优亚洲男人天堂| 一区二区三区精品91| 女的被弄到高潮叫床怎么办| 亚洲精品色激情综合| 国产精品国产av在线观看| 最近中文字幕高清免费大全6| 久久久久久久久久人人人人人人| 亚洲欧美中文字幕日韩二区| 亚洲熟女精品中文字幕| 日日啪夜夜爽| 一级毛片电影观看| 日本黄色日本黄色录像| av线在线观看网站| 99热国产这里只有精品6| 少妇精品久久久久久久| 在线观看国产h片| 女性生殖器流出的白浆| 麻豆成人午夜福利视频| 日本色播在线视频| 久久久久久久亚洲中文字幕| 噜噜噜噜噜久久久久久91| av有码第一页| 麻豆成人午夜福利视频| 日本色播在线视频| 亚洲av成人精品一区久久| 久久午夜综合久久蜜桃| 日韩熟女老妇一区二区性免费视频| 日本欧美国产在线视频| 国产精品成人在线| 精品亚洲成a人片在线观看| 免费久久久久久久精品成人欧美视频 | 肉色欧美久久久久久久蜜桃| 国产美女午夜福利| 国内揄拍国产精品人妻在线| 久久精品熟女亚洲av麻豆精品| 在线观看美女被高潮喷水网站| 久久久久久久久久人人人人人人| 最近的中文字幕免费完整| 少妇丰满av| 国产色婷婷99| 久久久久久久精品精品| 永久网站在线| 热re99久久精品国产66热6| 久久久久久伊人网av| 欧美变态另类bdsm刘玥| 毛片一级片免费看久久久久| 久久热精品热| 九九爱精品视频在线观看| 一边亲一边摸免费视频| 国产在线视频一区二区| 国产精品嫩草影院av在线观看| 久久99蜜桃精品久久| 99久久人妻综合| 欧美国产精品一级二级三级 | 在线 av 中文字幕| 亚洲天堂av无毛| 亚洲第一av免费看| 日本爱情动作片www.在线观看| 肉色欧美久久久久久久蜜桃| 欧美丝袜亚洲另类| 日韩中文字幕视频在线看片| 内射极品少妇av片p| 免费观看的影片在线观看| 国产黄频视频在线观看| 国产色爽女视频免费观看| 一级二级三级毛片免费看| av福利片在线观看| 99热全是精品| 少妇人妻久久综合中文| 熟女av电影| 人妻人人澡人人爽人人| 久久99精品国语久久久| 免费黄频网站在线观看国产| 天堂8中文在线网| 日本-黄色视频高清免费观看| 国产亚洲一区二区精品| 久久久久视频综合| 99re6热这里在线精品视频| 日韩免费高清中文字幕av| 久久久午夜欧美精品| 亚洲图色成人| 中国国产av一级| 最近中文字幕2019免费版| 韩国av在线不卡| 国产成人91sexporn| 日韩成人伦理影院| 亚洲欧美清纯卡通| 深夜a级毛片| 午夜影院在线不卡| 国产高清有码在线观看视频| 高清黄色对白视频在线免费看 | 亚洲av福利一区| 久久精品国产亚洲av涩爱| 国产精品熟女久久久久浪| 国产熟女午夜一区二区三区 | 亚洲精品自拍成人| 极品少妇高潮喷水抽搐| 亚洲情色 制服丝袜| 欧美xxⅹ黑人| 晚上一个人看的免费电影| 国产男女内射视频| 五月开心婷婷网| 丝袜脚勾引网站| 国产伦精品一区二区三区视频9| 18+在线观看网站| 亚洲综合精品二区| 日本色播在线视频| 久久这里有精品视频免费| 91久久精品国产一区二区成人| 男女啪啪激烈高潮av片| 国产日韩欧美亚洲二区| 久久影院123| 色94色欧美一区二区| 一本一本综合久久| 免费观看在线日韩| 久久久久精品久久久久真实原创| 国产69精品久久久久777片| 亚洲熟女精品中文字幕| 国产欧美日韩一区二区三区在线 | 亚洲欧美成人综合另类久久久| 欧美一级a爱片免费观看看| 一级毛片电影观看| 九草在线视频观看| 精品卡一卡二卡四卡免费| 久久99一区二区三区| 久久久久国产精品人妻一区二区| 少妇人妻一区二区三区视频| 亚洲精品一区蜜桃| 在线观看三级黄色| 亚洲性久久影院| 99九九在线精品视频 | 久久久久国产精品人妻一区二区| 91aial.com中文字幕在线观看| 国产深夜福利视频在线观看| 久久久久视频综合| 亚洲欧美成人精品一区二区| 卡戴珊不雅视频在线播放| 国产有黄有色有爽视频| 国产精品嫩草影院av在线观看| 只有这里有精品99| 国产欧美日韩一区二区三区在线 | 免费观看性生交大片5| 精品国产一区二区三区久久久樱花| 国产淫片久久久久久久久| 深夜a级毛片| 老女人水多毛片| 成人18禁高潮啪啪吃奶动态图 | 国产精品不卡视频一区二区| 高清不卡的av网站| 欧美xxⅹ黑人| 欧美3d第一页| 十分钟在线观看高清视频www | 欧美日韩视频精品一区| 又爽又黄a免费视频| 精品久久久久久久久av| 国产欧美亚洲国产| 日本欧美国产在线视频| 欧美日韩综合久久久久久| 国产亚洲精品久久久com| 亚洲精品久久久久久婷婷小说|