Journal of Materials Science: Materials in Electronics最新文献_第4页

Influence of structural changes on electrical properties of glasses from the SbxAs37-xS48I15 system 结构变化对SbxAs37-xS48I15体系玻璃电性能的影响

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-24 DOI: 10.1007/s10854-025-14825-9

Goran R. Štrbac, Ondrej Bošák, Dragana D. Štrbac, Marian Kubliha, Martin Sahul

{"title":"Influence of structural changes on electrical properties of glasses from the SbxAs37-xS48I15 system","authors":"Goran R. Štrbac, Ondrej Bošák, Dragana D. Štrbac, Marian Kubliha, Martin Sahul","doi":"10.1007/s10854-025-14825-9","DOIUrl":"10.1007/s10854-025-14825-9","url":null,"abstract":"<div>This study presents the results of electrical conductivity measurements for glasses from the SbxAs37-xS48I15 system, conducted in both DC and AC regimes. Measurements were carried out on both amorphous and annealed samples, with crystallization of SbSI and Sb2S3 structural units induced in the latter. The findings reveal that the conductivity of the annealed samples is several times higher than that of the amorphous samples, which could be crucial information for applications in electronics, such as memory devices. The temperature dependence of conductivity follows Arrhenius behavior, with the activation energy EDC determined by fitting the DC conductivity data to the temperature variation. This activation energy decreases as the proportion of antimony increases. Frequency-dependent conductivity tests revealed that conductivity rises with higher temperature, increased antimony content, and frequency. Measurements were taken across a frequency range of 0 to 105 Hz and a temperature range from room temperature to 398 K. The EAC values at 100 Hz and 1000 Hz were also obtained, indicating complex relaxation mechanisms in this regime. Impedance spectra were analyzed using an equivalent circuit model, allowing the determination of relaxation time values and the activation energies associated with the relaxation process. The presence of a temperature-dependent electrical relaxation phenomenon of the non-Debye type was confirmed. Additionally, the effects of frequency and temperature on the loss factor (ε′′) were analyzed within the measured frequency range.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of gold doping via laser ablation on the structural, morphologic, and optical properties of CdS thin films for use in optoelectronic applications 激光烧蚀金掺杂对光电子用CdS薄膜结构、形貌和光学性能的影响

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-24 DOI: 10.1007/s10854-025-14811-1

Jamal Aziz, R. K. Fakher Alfahed, Faten Sh. Zainulabdeen

{"title":"Effect of gold doping via laser ablation on the structural, morphologic, and optical properties of CdS thin films for use in optoelectronic applications","authors":"Jamal Aziz, R. K. Fakher Alfahed, Faten Sh. Zainulabdeen","doi":"10.1007/s10854-025-14811-1","DOIUrl":"10.1007/s10854-025-14811-1","url":null,"abstract":"<div>This study reports the preparation of cadmium sulfide (CdS) sol–gel doped with Gold (Au) nanoparticles synthesized using a laser ablation method and the fabrication of thin films via spin-coating. Gold nanoparticles were produced by irradiating an Au target with a Q-switched Nd: YAG laser (1064 nm) at pulse numbers ranging from 500 to 2500. X-ray diffraction analysis confirmed a hexagonal nanostructure for CdS, with an average crystal size of 11.57 nm in pure films. In comparison, Au doping resulted in crystal sizes between 6.6 and 9.3 nm, depending on pulse number. Atomic force microscopy (AFM) revealed reduced grain sizes from 72.44 nm in pure films to 25.8 nm in Au-doped films at 2000 pulses. Optical absorption spectra (300–800 nm) indicated a decrease in the band gap from 2.39 (pure films) to 2.33 eV (doped films with the highest pulse number). Nonlinear optical properties, evaluated using the Z-scan technique, showed variations in thermal refractive index (({n}_{2})) and optical limiting (OL) behavior with increasing pulse number. These results highlight the tunable optical and structural properties of Au-doped CdS films, making them promising candidates for optoelectronic applications.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optical and structural characterization of SILAR-coated Mn-doped ZnS films for LEDs 用于led的silar涂层mn掺杂ZnS薄膜的光学和结构表征

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-24 DOI: 10.1007/s10854-025-14792-1

Emmanuel Tom, P. V. Jithin, Abhijai Velluva, Sijo Arackal Kuriakose, Mithra Geetha, Kishor Kumar Sadasivuni, M. V. Ajith, K. Rhithulraj, Joji Kurian

{"title":"Optical and structural characterization of SILAR-coated Mn-doped ZnS films for LEDs","authors":"Emmanuel Tom, P. V. Jithin, Abhijai Velluva, Sijo Arackal Kuriakose, Mithra Geetha, Kishor Kumar Sadasivuni, M. V. Ajith, K. Rhithulraj, Joji Kurian","doi":"10.1007/s10854-025-14792-1","DOIUrl":"10.1007/s10854-025-14792-1","url":null,"abstract":"<div>This study explores the structural and optical properties of Zn1-xMnxS thin films, with varying Mn content (x) between 0 and 0.07. These films are meticulously fabricated on glass substrates using the successive ionic layer adsorption and reaction method. The results confirm the polycrystalline nature of these samples, revealing their crystallization in a cubic phase with the Fm-3 m space group, and providing insights into their fundamental structural makeup. Notably, these films possess a nanocrystalline character, with grain sizes ranging from 2.7 to 2.1 nm, indicating a finely textured structure at the nanoscale. The optical band gap energy, determined using Tauc's plot method, ranges from 3.53 to 3.56 eV. In the realm of optics, the study unveils that the incorporation of manganese dopant has minimal impact on the optical band gap energy, showing only minor fluctuations. This makes Mn-doped ZnS a promising material for optoelectronic applications due to its minimal absorption losses in the visible spectrum. Additionally, the research uncovers vital details about defect levels, including cation and anion vacancies, obtained through photoluminescence measurements. These defects have the potential to significantly influence the material’s electronic properties and its suitability for various applications. The utilization of a chromaticity diagram in the study elucidates the promising potential of this engineered material within the semiconductor sector, especially in the context of light-emitting diode (LED) technology, where its efficient light-emitting properties are poised to make a substantial contribution.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10854-025-14792-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An efficient and well-organized sensing process of SERS sensors via synthesis of nanoparticles with laser pulse repetition rate 通过合成具有激光脉冲重复率的纳米粒子，实现了高效、有序的SERS传感器传感过程

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-24 DOI: 10.1007/s10854-025-14814-y

Amer B. Dheyab, Alwan M. Alwan, Allaa A. Jabbar

{"title":"An efficient and well-organized sensing process of SERS sensors via synthesis of nanoparticles with laser pulse repetition rate","authors":"Amer B. Dheyab, Alwan M. Alwan, Allaa A. Jabbar","doi":"10.1007/s10854-025-14814-y","DOIUrl":"10.1007/s10854-025-14814-y","url":null,"abstract":"<div>This work concerns improving the sensing process of Bisphenol A in drinking water using Ag core/Au shell nanoparticles (AgAu-C/S NPs) prepared by various Laser Pulse Repetition Rate (LPRR) to synthesize an efficient and well-organized SERS sensor. The novel SERS substrate enhancing (AgAu-C/S NPs) was specifically designed to enhance the sensitivity and selectivity of bisphenol A (BPA) detection in drinking water. The (AgAu-C/S NPs) developments address fundamental gaps in the current research, particularly regarding improved detection limits and practical applications in real-world conditions. A precisely controlled pulsed laser ablation (LA) process was employed to synthesize Ag core/Au shell nanoparticles by targeting gold and silver with varying laser pulse repetition rates (LPRR) ranging from 300 to 600 pulses. This method enabled the production of nanoparticles with diverse sizes, colloidal densities, and variations in hot spot junction vacancies. The results exposed a significant dependence of the LIMIT of detection (LOD) and intensity enhancement factor (EF) on the LPRR. The lowest (LO D) and highest value in (EF) of 1 × 10–10 M, and 140,000, respectively, were achieved at a LPRR of 500 pulses when compared with other rates. Owing to the high density, small size of the (AgAu-C/S NPs), and the presence of hot spot junctions, combined with their high specific surface area, the system demonstrates exceptional detection. This enables the efficient detection of bisphenol A (BPA) at concentrations as low as 2.6 × 10⁻⁶ M, which is below the globally accepted minimum intake limit.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Synthesis and characterization of ultrathin ZnS(en)0.5 nanolayers and their application as cathodes in lithium-ion batteries 超薄ZnS(en)0.5纳米层的合成、表征及其在锂离子电池负极中的应用

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-24 DOI: 10.1007/s10854-025-14739-6

A. Romero-Contreras, L. L Garza-Tovar, A. Hernández-Gordillo, L. Cerezo-Durán, E. González-Juárez, E. M. Sánchez-Cervantes

{"title":"Synthesis and characterization of ultrathin ZnS(en)0.5 nanolayers and their application as cathodes in lithium-ion batteries","authors":"A. Romero-Contreras, L. L Garza-Tovar, A. Hernández-Gordillo, L. Cerezo-Durán, E. González-Juárez, E. M. Sánchez-Cervantes","doi":"10.1007/s10854-025-14739-6","DOIUrl":"10.1007/s10854-025-14739-6","url":null,"abstract":"<div>Zinc sulfide (ZnS) materials have been attracting much interest as potential conversion electrode materials for Li-ion batteries due to their high theoretical capacity. To improve the capacity of ZnS electrodes, several attempts involving changes in morphology by incorporating additives during the synthesis process have been addressed. For example, the addition of ethylenediamine (en) has been studied and proven to result in the formation of ZnS(en)0.5 exfoliated materials, which are promising as electrodes in batteries. Herein, we synthesized ZnS(en)0.5 complex materials using two Zn salt precursors. X-ray diffraction and FTIR characterization revealed the presence of orthorhombic ZnS(en)0.5 material independent of the synthesis method. SEM images were obtained to correlate the changes in nanoparticle shape and size according to the synthesis method. Additionally, electrochemical test results revealed that the mechanism involved in the charge/discharge phenomena is influenced by the Li+ movement into the electrode, not through the ethylenediamine structural channels, but on the surface of ZnS, allowing the formation of Zn-ethylenediamine-S alloys.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrothermally synthesized polyaniline/copper oxide nanocomposites: a study on structural, optical, and photoluminescence properties 水热合成聚苯胺/氧化铜纳米复合材料：结构、光学和光致发光性能的研究

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-23 DOI: 10.1007/s10854-025-14684-4

Saeid M. Elkatlawy, Noura M. Saleh, E. M. El-Maghraby, Abdelhamid A. Sakr

{"title":"Hydrothermally synthesized polyaniline/copper oxide nanocomposites: a study on structural, optical, and photoluminescence properties","authors":"Saeid M. Elkatlawy, Noura M. Saleh, E. M. El-Maghraby, Abdelhamid A. Sakr","doi":"10.1007/s10854-025-14684-4","DOIUrl":"10.1007/s10854-025-14684-4","url":null,"abstract":"<div>The hydrothermal method was employed for the synthesis of polyaniline conductive polymer, and its combination with copper oxide semiconductor. Infrared spectral analysis confirmed the formation of both pristine and copper oxide-doped polyaniline. The material exhibited a well-defined heterogeneous structure comprising polyaniline nanoflakes and copper oxide nanoparticles with particle sizes ranging from 31 to 36 nm, as confirmed by scanning electron micrographs and energy dispersive X-ray analysis. Powder X-ray diffraction analysis confirmed the semicrystalline nature of pristine polyaniline and the co-existence of crystalline peaks for both divalent (CuO) and monovalent (Cu2O) copper oxide. Interestingly, optical absorption and band gap calculations revealed a consistent optical band gap for both pristine and copper oxide-doped polyaniline. Photoluminescence analysis showed significant changes in the electronic structure upon doping and interaction between polyaniline and copper oxide. Notably, the pure PANI sample possesses a strong and sharp emission peak in the visible light region. Furthermore, the incorporation of copper oxide effectively quenched the photoluminescence emission of pure sample. The variation in the emission peak position is attributable to the electron–hole recombination mechanisms. PL quenching is concentration-dependent, indicating that the amount of CuO directly influences quenching efficiency. Energy transfer and/or electron transfer are the most likely mechanisms responsible for this quenching, with each mechanism playing a role depending upon the specific conditions of the PANI/CuO interaction. This dual mechanism highlights the complex nature of energy transfer in these nanocomposites. Our results suggest that the hydrothermally synthesized polyaniline/copper oxide nanocomposites are promising candidates for PL, OLEDs, and OPVs applications.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Structural, thermal, optical, and magnetic behavior of the nanosized perovskite-like GdFeO3 synthesized by modified co-precipitation method 改性共沉淀法合成纳米钙钛矿样GdFeO3的结构、热、光学和磁性行为

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-23 DOI: 10.1007/s10854-025-14805-z

Hoang Huy Nguyen, Thi Thu Trang Nguyen, Valentina Olegovna Mittova, Elena Viktorovna Tomina, Anh Thi Ngoc Vu, Anh Tien Nguyen

{"title":"Structural, thermal, optical, and magnetic behavior of the nanosized perovskite-like GdFeO3 synthesized by modified co-precipitation method","authors":"Hoang Huy Nguyen, Thi Thu Trang Nguyen, Valentina Olegovna Mittova, Elena Viktorovna Tomina, Anh Thi Ngoc Vu, Anh Tien Nguyen","doi":"10.1007/s10854-025-14805-z","DOIUrl":"10.1007/s10854-025-14805-z","url":null,"abstract":"<div>GdFeO3 nanoparticles were synthesized using an improved co-precipitation method using a 5% ammonium hydrogen carbonate solution, followed by annealing for 1 h at 750, 850, and 950 °C. The synthesized samples were characterized using DSC/TGA, FTIR, PXRD, TEM, EDX/EDX-mapping, UV–Vis, and VSM analyses. The DSC curve exhibited two endothermic peaks (70.45 and 141.30 °C) and three exothermic peaks (333.01, 480.93, and 723.41 °C), while TGA analysis indicated that mass loss ceased at approximately 750 °C. PXRD patterns of all calcined samples confirmed a perovskite structure with space group Pbnm, and the average crystalline size and lattice volume increased with rising annealing temperatures. TEM images revealed that the synthesized GdFeO3 nanoparticles were weakly angular spherical particles ranging from approximately 20–55 nm. Magnetic analysis showed that the GdFeO3 orthoferrite nanopowder exhibited paramagnetic behavior, with net magnetization (Mn ~ 1.4 – 2.0 emu·g−1) increasing with calcination temperature while maintaining negligible remanence and coercivity. Additionally, the nanoparticles displayed strong optical absorption in the UV (λ ~ 200 – 400 nm) and visible (λ ~ 400 – 600 nm) regions. Compared to certain reported RFeO3 perovskites (R = Gd, Nd, Y, La, Ho), the synthesized GdFeO3 nanopowder demonstrated both higher magnetization and a significantly lower band gap energy.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Growth of molybdenum oxide (α-MoO3) layers through proximity evaporation: studying electronic properties and photo-responsivity 近距离蒸发法制备氧化钼（α-MoO3）层：研究其电子性能和光响应性

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-23 DOI: 10.1007/s10854-025-14784-1

Kurapati Kalyan, Sailakshmi Janga, Shaik M. Abzal, Paramita Maiti, Deepak Kumar Gupta, T. R. Ravindran, Rajkumar Patel, Jatis Kumar Dash

{"title":"Growth of molybdenum oxide (α-MoO3) layers through proximity evaporation: studying electronic properties and photo-responsivity","authors":"Kurapati Kalyan, Sailakshmi Janga, Shaik M. Abzal, Paramita Maiti, Deepak Kumar Gupta, T. R. Ravindran, Rajkumar Patel, Jatis Kumar Dash","doi":"10.1007/s10854-025-14784-1","DOIUrl":"10.1007/s10854-025-14784-1","url":null,"abstract":"<div>In this study, we successfully synthesized α-MoO3 nanolayers using a proximity evaporation technique, positioning the Mo film approximately 1 mm from the target substrate at atmospheric conditions. This novel method bypasses the need for supplemental oxygen sources by utilizing ambient oxygen, resulting in cost-effective and scalable production of MoO3. The α-MoO3 films synthesized at an optimal growth temperature of 550 °C demonstrate well-controlled layer thickness, high crystallinity, and uniform stoichiometry. Detailed characterizations were performed, including XRD for crystallographic confirmation, SEM–EDS for morphology and stoichiometry, Raman spectroscopy for vibrational modes, and UV–Vis for optical properties, revealing a tunable bandgap of approximately 3.7 eV. I-V measurements indicated a high resistance of 8.7 × 106 Ω, confirming the material’s insulating nature, and an optimum dielectric constant of 1253. Photo-response measurements demonstrated a significant photocurrent increase under illumination, with responsivity 8.8 A.W−1, detectivity1.2 × 1013 J, and quantum efficiency of 18.5%, respectively. The proposed proximity evaporation technique demonstrates potential as a scalable approach for synthesizing high-quality two-dimensional (2D) transition metal oxides like MoO3, with implications for applications in optoelectronics and sensing.</div>","PeriodicalId":646,"journal":{"name":"Journal of Materials Science: Materials in Electronics","volume":"36 12","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Observation of room-temperature robust three-terminal Hanle signal in Co2TiSi/SiO2/n-Si Heterostructure Co2TiSi/SiO2/n-Si异质结构中室温鲁棒三端Hanle信号的观察

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-23 DOI: 10.1007/s10854-025-14790-3

Sajib Biswas, Niladri Sekhar Kander, Safikul Islam, Amal Kumar Das

引用次数: 0

High corrosion resistance and tensile strength in SAC305/Cu solder joint via super-rapid cooling SAC305/Cu焊点通过超快速冷却，具有较高的耐腐蚀性和抗拉强度

IF 2.8 4区工程技术

Journal of Materials Science: Materials in Electronics Pub Date : 2025-04-23 DOI: 10.1007/s10854-025-14787-y

Jiyou Yang, Hao Ren, Linmei Yang, Te Huang, Bayaer Buren, Yawei Liang

引用次数: 0