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多孔硅结构电镜图像的数字处理 被引量:1
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作者 李格 《江苏石油化工学院学报》 2002年第4期39-41,共3页
多孔硅在光电子和传感器领域是一种具有重要应用价值的材料,多孔硅网络结构的形状纹理直接影响其光学和热学性能。运用数字图像处理分析方法对多孔硅结构电子显微镜图像(SEM)进行特征提取,为多孔化率的测定提供了重要依据。
关键词 多孔硅结构 电镜图像 数字处理 图像处理 纹理分析 多孔化率
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多孔硅制备及在太阳能电池中的应用研究进展
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作者 李浩杨 任永生 +5 位作者 马文会 詹曙 曾毅 刘国炎 王正省 王哲 《功能材料》 CAS CSCD 北大核心 2023年第12期12045-12055,共11页
多孔硅是通过对单晶硅片进行电化学腐蚀或适当的化学腐蚀而形成的一种纳米结构半导体材料。多孔硅纳米材料因其巨大的表面积、可调谐的光学性质和良好的相容性,被广泛应用于电子器件、生物传感、化学传感、药物传递、生物芯片等诸多领... 多孔硅是通过对单晶硅片进行电化学腐蚀或适当的化学腐蚀而形成的一种纳米结构半导体材料。多孔硅纳米材料因其巨大的表面积、可调谐的光学性质和良好的相容性,被广泛应用于电子器件、生物传感、化学传感、药物传递、生物芯片等诸多领域。当前研究的挑战主要在于开发更简单高效的多孔硅纳米材料合成方法以及提高其在实际应用中的表现。综述了多孔硅纳米材料的制备方法及其光致发光在太阳能电池领域中的应用。 展开更多
关键词 多孔制备 化学刻蚀 MACE 电化学腐蚀 溶液合成 光致发光 多孔光波转换结构
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金属/多孔硅/硅结构发光器件输运特性的研究
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作者 卓敬清 李宏建 +1 位作者 夏辉 崔昊杨 《半导体光电》 EI CAS CSCD 北大核心 2008年第4期482-486,共5页
基于Vlkulov等人对金属/多孔硅/硅结构输运特性的研究,分析了载流子在金属/多孔硅/硅结构中的输运过程,研究了各层中电场强度以及电压的分布,讨论了镜像势在正反向偏压下对金属/多孔硅/硅结构I-V特性的影响。结果表明:金属/多孔硅/硅结... 基于Vlkulov等人对金属/多孔硅/硅结构输运特性的研究,分析了载流子在金属/多孔硅/硅结构中的输运过程,研究了各层中电场强度以及电压的分布,讨论了镜像势在正反向偏压下对金属/多孔硅/硅结构I-V特性的影响。结果表明:金属/多孔硅/硅结构中电流主要受表面态电荷和界面层影响,改变多孔硅层厚度将导致各层中电压的重新分布,不管是正向偏压还是反向偏压,电流随厚度的增加而减小;镜像势在正向偏压时对电流的影响可以忽略,但随反向偏压增大镜像势对电流的影响越来越大。 展开更多
关键词 多孔 金属/多孔/结构 输运特性 镜像势
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Preparation and electrochemical lithium storage performance of porous silicon microsphere composite with metal modification and carbon coating
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作者 XU Zeyu LU Tongzhou +1 位作者 SHAO Haibo WANG Jianming 《无机化学学报》 SCIE CAS CSCD 北大核心 2024年第10期1995-2008,共14页
This work adopts a multi⁃step etching⁃heat treatment strategy to prepare porous silicon microsphere com⁃posite with Sb⁃Sn surface modification and carbon coating(pSi/Sb⁃Sn@C),using industrial grade SiAl alloy micro⁃sp... This work adopts a multi⁃step etching⁃heat treatment strategy to prepare porous silicon microsphere com⁃posite with Sb⁃Sn surface modification and carbon coating(pSi/Sb⁃Sn@C),using industrial grade SiAl alloy micro⁃spheres as a precursor.pSi/Sb⁃Sn@C had a 3D structure with bimetallic(Sb⁃Sn)modified porous silicon micro⁃spheres(pSi/Sb⁃Sn)as the core and carbon coating as the shell.Carbon shells can improve the electronic conductivi⁃ty and mechanical stability of porous silicon microspheres,which is beneficial for obtaining a stable solid electrolyte interface(SEI)film.The 3D porous core promotes the diffusion of lithium ions,increases the intercalation/delithia⁃tion active sites,and buffers the volume expansion during the intercalation process.The introduction of active met⁃als(Sb⁃Sn)can improve the conductivity of the composite and contribute to a certain amount of lithium storage ca⁃pacity.Due to its unique composition and microstructure,pSi/Sb⁃Sn@C showed a reversible capacity of 1247.4 mAh·g^(-1) after 300 charge/discharge cycles at a current density of 1.0 A·g^(-1),demonstrating excellent rate lithium storage performance and enhanced electrochemical cycling stability. 展开更多
关键词 silicon⁃based anode porous structure metallic deposition carbon coating electrochemical lithium storage
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ZrO_(2)纳米颗粒对PEO涂层微观结构及热物理性能的影响
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作者 李国栋 齐少豹 +4 位作者 朱剑威 李志杰 马飞 李光 夏原 《表面技术》 EI CAS CSCD 北大核心 2022年第2期375-383,共9页
目的提高PEO涂层的热物理性能。方法以活塞主流材料——高硅铝合金(ZL109)为基体,在硅酸盐系电解液中,添加不同浓度的ZrO_(2)纳米颗粒,制备一系列ZrO_(2)/Al_(2)O_(3)复合PEO涂层,并通过涡流测厚仪、扫描电子显微镜(SEM)、能谱仪(EDS)及... 目的提高PEO涂层的热物理性能。方法以活塞主流材料——高硅铝合金(ZL109)为基体,在硅酸盐系电解液中,添加不同浓度的ZrO_(2)纳米颗粒,制备一系列ZrO_(2)/Al_(2)O_(3)复合PEO涂层,并通过涡流测厚仪、扫描电子显微镜(SEM)、能谱仪(EDS)及X射线衍射仪(XRD)分析ZrO_(2)纳米颗粒对涂层生长、微观形貌、元素组成及晶相结构的影响规律。利用差式扫描热量仪(DSC)、激光导热仪(LFA)等设备探究各涂层的热物理性能。结果在PEO放电过程中,添加ZrO_(2)纳米颗粒使陶瓷膜两侧的击穿电压下降,当ZrO_(2)的质量浓度达到9 g/L时,击穿电压的下降幅度达30 V。ZrO_(2)能抑制陶瓷层中α-Al_(2)O_(3)晶体的生长,同时受放电能量的影响,涂层中的c-ZrO_(2)结晶度先增高、后降低。当ZrO_(2)的质量浓度为1.5 g/L时,涂层的微观形貌呈大孔嵌套小孔的“蜂巢”结构,并使涂层具有显著的低导热(0.13 W/(K·m))特性。当ZrO_(2)的质量浓度为3 g/L时,涂层表面出现显著的微裂纹,开放型孔洞增加,热扩散系数增大(0.7 mm^(2)/s),热导率最高(0.42 W/(K·m))。结论ZrO_(2)的引入可以显著改变涂层的微观结构和热物理性能,当ZrO_(2)含量控制在一定量时,复合PEO涂层呈封闭型微孔结构,有助于降低涂层的比热容、热导及热扩散系数。 展开更多
关键词 等离子体电解氧化 防护涂层 ZrO_(2) 热物理性能 铝合金:多孔结构
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Using AFM to Determine the Porosity in Porous Silicon 被引量:1
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作者 Faten Alfeel Fowzi Awad Ibrahim Alghoraibi Fadi Qamar 《材料科学与工程(中英文A版)》 2012年第9期579-583,共5页
关键词 原子力显微镜 多孔硅结构 孔隙率 孔隙度指数 电化学蚀刻 重力技术 电流密度 光学性质
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M/P的Schottky结光伏吸收模型研究
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作者 黄伟其 陈朝纲 《贵州教育学院学报》 2000年第2期47-48,共2页
报告了M/P的Schottky结光伏吸收特性,给出对应介层的原子团蔟新模型,较好地解释了实验结果。
关键词 原子团蔟 光伏吸收 肖特基结 M/结构 多孔金属膜结构
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Neah公司开发多孔硅电极
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作者 王凤娥(摘译) 《现代材料动态》 2007年第8期9-9,共1页
美国西雅图的燃料电池开发商Neah powersy stemsInc.公司研究显示多孔硅结构经过改进可以优化16电池堆的性能。Neah公司用液体燃料流、氧化剂和电解质代替质子交换膜和空气电极。多孔硅基电极结构有助于实现这一工艺。
关键词 多孔硅结构 空气电极 开发商 Inc.公司 质子交换膜 燃料电池 液体燃料 电极结构
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Preparation and characteristics of biosilica derived from marine diatom biomass of Nitzschia closterium and Thalassiosira 被引量:1
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作者 漆亚 王欣 成家杨 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2017年第3期668-680,共13页
In this study, biosilica of high purity was successfully prepared from marine diatom (Nitzschia closterium and Thalassiosira) biomass using an optimized novel method with acid washing treatment followed by thermal t... In this study, biosilica of high purity was successfully prepared from marine diatom (Nitzschia closterium and Thalassiosira) biomass using an optimized novel method with acid washing treatment followed by thermal treatment of the biomass. The optimal condition of the method was 2% diluted HCl washing and baking at 600℃. The SiO2 contents of N. closterium biosilica and Thalassiosira biosilica were 92.23% and 91.52%, respectively, which were both higher than that of diatomite biosilica. The SiO2 morphologies of both biosilica are typical amorphous silica. Besides, IV. closterium biosilica possessed micropores and fibers with a surface area of 59.81 m^2/g. And Thalassiosira biosilica possessed a mesoporous hierarchical skeleton with a surface area of 9.91 m^2/g. The results suggest that the biosilica samples obtained in this study present highly porous structures. The prepared porous biosilica material possesses great potential to be used as drug delivery carrier, biosensor, biocatalyst as well as adsorbent in the future. 展开更多
关键词 BIOSILICA PREPARATION DIATOM Nitzschia closterium THALASSIOSIRA
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Electron Field Emission from Patterned Porous Silicon Film
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作者 SHU Yun-xing GE Bo +1 位作者 ZHANG Yong-sheng YU Ke 《Semiconductor Photonics and Technology》 CAS 2005年第3期179-183,共5页
Patterned porous silicon (PS) films were synthesised by using bydrogen ion implantation technique and typical electrochemical anodic etching method.The surface morphology and characteristics of the PS films were cha... Patterned porous silicon (PS) films were synthesised by using bydrogen ion implantation technique and typical electrochemical anodic etching method.The surface morphology and characteristics of the PS films were characterized by scanning electron microscopy (SEM),X-ray diffraction(XRD),and atomic force microscopy (AFM).The efficient electron field emission with low turn-on field of about 3.5V/μm was obtained at current density of 0.1μA/cm^2.The electron field emission current density from the patterned PS films reached 1mA/cm^2 under and applied field of about 12.5V/μm.The experimental results show that the patterned PS films are of certain practical significance and are valuable for flat panel displays. 展开更多
关键词 Electron field emission SYNTHESIS Patterned porous silicon NANOSTRUCTURE ZNO
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Mesoporous Co3O4 as an electrocatalyst for water oxidation 被引量:12
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作者 itHarun Tueysuez Yun Jeong Hwang +2 位作者 Sher Bahadar Khan Abdullah Mohamed Asiri Peidong Yang 《Nano Research》 SCIE EI CAS CSCD 2013年第1期47-54,共8页
MesoporousCo3O4 has been prepared using porous silica as a hard template via a nanocasting route and its electrocatalytic properties were investigated as an oxygen evolution catalyst for the electrolysis of water. The... MesoporousCo3O4 has been prepared using porous silica as a hard template via a nanocasting route and its electrocatalytic properties were investigated as an oxygen evolution catalyst for the electrolysis of water. The ordered mesostructured Co3O4 shows dramatically increased catalytic activity compared to that of bulk Co3O4. Enhanced catalytic activity was achieved with high porosity and surface area, and the water oxidation overpotential (η) of the ordered mesoporous Co3O4 decreases significantly as the surface area increases. The mesoporous Co3O4 also shows excellent structural stability in alkaline media. After 100 min under 0.8 V (versus Ag/AgC1) applied bias, the sample maintains the ordered mesoporous structure with little deactivation of the catalytic properties. 展开更多
关键词 water oxidation ELECTROCATALYST ordered mesoporousmaterials NANOCASTING
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Effect of agarose content on microstructures and mechanical properties of porous silicon nitride ceramics produced by gelcasting 被引量:2
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作者 Jing-yi ZHANG Feng YE 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2010年第10期771-775,共5页
Porous Si3N4 self-reinforce ceramics were prepared by gelcasting using agarose solutions. By changing the agarose content in the slurries, the porous silicon nitride ceramics with different porosities, α→β-Si3N4 ph... Porous Si3N4 self-reinforce ceramics were prepared by gelcasting using agarose solutions. By changing the agarose content in the slurries, the porous silicon nitride ceramics with different porosities, α→β-Si3N4 phase transformation, and mechanical properties were obtained. When the agarose content changed from 0.2% to 0.8% (w/w, based on powder), the porosities increased from 10.3% to 21.4%, while the fracture strength decreased from 455 to 316 MPa and the fracture toughness decreased from 6.6 to 5.5 MPa·m1/2. Many fibrous β-Si3N4 grains grown from the internal wall of the round pores is the typical microstructure of the gelcasting porous silicon nitride ceramic. Both elongated β-Si3N4 grains and suitable interfacial bonding strength contributes to high fracture toughness by favoring crack deflection and bridging. The growth mechanisms of fibrous grains resulted from the synergy of solution-diffusion-reprecipitation and vapor-liquid-solid (VLS). 展开更多
关键词 Porous Si3N4 ceramics GELCASTING Microstructure Mechanical properties
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Recent advances on silica-based nanostructures in photocatalysis 被引量:5
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作者 Heng Wang Qian Tang +2 位作者 Zhen Chen Tao Li Jingyu Wang 《Science China Materials》 SCIE EI CSCD 2020年第11期2189-2205,共17页
Development of highly efficient photocatalysts has emerged as a research hotspot because of their crucial role in affecting the conversion efficiency of solar energy for applications in resource exploitation and envir... Development of highly efficient photocatalysts has emerged as a research hotspot because of their crucial role in affecting the conversion efficiency of solar energy for applications in resource exploitation and environmental purification.The photocatalytic performance of the photocatalysts basically depends on the behaviors of light absorption,charge generation and separation,surface property and structural stability.Owing to its unique advantages(high surface area,tunable porosity,modifiable surface),porous silica provides an interesting platform to construct well-defined nanostructures such as core-shell,yolk-shell and other specific structures which effectively improved one or more of the above behaviors for photocatalysis.Typically,the structure with hollow morphology favors the light scattering and enlargement of surface area,while coating or binding with silica can modify the surface property of a photocatalyst to enhance the surface adsorption of reactants and physicochemical stability of catalysts.This review discusses the recent advances in the design,synthesis,formation mechanism of well-defined silica-based nanostructures,and the achievements of desired physicochemical properties for regulating the photocatalytic performance. 展开更多
关键词 composite photocatalyst SILICA structural design ENVIRONMENT ENERGY
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Fractal structure reconstruction for alumina-silicate refractory fiber and simulation of the thermal conductivity 被引量:1
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作者 XIA Dehong,GUO Shanshan,and Ren Ling Department of Thermal Engineering,University of Science and Technology Beijing,Beijing 100083,China 《Journal of Thermal Science》 SCIE EI CAS CSCD 2010年第1期80-86,共7页
In this paper, it is proved that the intemal porous structure of alumina-silicate refractory fiber has fractal characteristics, which is reconstructed by the computer and the reconstructed structure further proved to ... In this paper, it is proved that the intemal porous structure of alumina-silicate refractory fiber has fractal characteristics, which is reconstructed by the computer and the reconstructed structure further proved to have fractal characteristics. Based on the reconstructed structure, the network-thermal-resistance model is established to calculate the thermal conductivity of the fiber. It is shown that the calculated results agree well with the previous experimental ones, proving the correctness of the method. 展开更多
关键词 FRACTAL refractory fiber thermal conductivity
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Structure and photoluminescence properties of InN films grown on porous silicon by MOCVD 被引量:1
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作者 王军 张红燕 《Optoelectronics Letters》 EI 2017年第3期214-216,共3页
In this work, indium nitride(InN) films were successfully grown on porous silicon(PS) using metal oxide chemical vapor deposition(MOCVD) method. Room temperature photoluminescence(PL) and field emission scanning elect... In this work, indium nitride(InN) films were successfully grown on porous silicon(PS) using metal oxide chemical vapor deposition(MOCVD) method. Room temperature photoluminescence(PL) and field emission scanning electron microscopy(FESEM) analyses are performed to investigate the optical, structural and morphological properties of the InN/PS nanocomposites. FESEM images show that the pore size of InN/PS nanocomposites is usually less than 4 μm in diameter, and the overall thickness is approximately 40 μm. The InN nanoparticles penetrate uniformly into PS layer and adhere to them very well. Nitrogen(N) and indium(In) can be detected by energy dispersive spectrometer(EDS). An important gradual decrease of the PL intensity for PS occurs with the increase of oxidation time, and the PL intensity of PS is quenched after 24 h oxidization. However, there is a strong PL intensity of InN/PS nanocomposites at 430 nm(2.88 eV), which means that PS substrate can influence the structural and optical properties of the InN, and the grown InN on PS substrate has good optical quality. 展开更多
关键词 MOCVD FESEM indium adhere nitride spectrometer dispersive uniformly Room porous
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