双牺牲层微测辐射热计最新研究进展

通过改善结构,来研制更小尺寸、更高分辨率的器件,成为微测辐射热计研制的新趋势,而其中最普遍的做法就是使用双牺牲层.本文介绍了双牺牲层微测辐射热计研究的最新成果,即以Raytheon和DRS等为代表的两种做法,并从器件结构和工艺上比较了两种思路的优劣.     

纳米NiAl_2O_4前驱体的电化学合成

在乙醇溶液中,按Ni/Al电量比为1∶3依次电解铝片和镍片,制得复合氧化物纳米粉体NiO Al2O3的前驱体NiAl2(OCH2CH3)(8-y)(acac)y[acac为乙酰丙酮基].产物通过红外光谱、X射线衍射、电子透射显微镜进行了表征,同时研究了镍电极在铝醇盐溶液中的电化学行为,讨论了影响电合成镍、铝醇盐配合物的关键因素.实验表明,电解温度控制在54～60℃、导电盐Bu4NBr浓度为0.040～0.045mol/L时,电流效率约为93%.水解后的干凝胶粒径在10nm左右,为纳米NiAl2O4粉体的制备创造了条件.     

直接甲醇燃料电池催化剂的制备与表征综合化学实验

将学科前沿领域的科研成果转化为研究型综合实验，结合新清洁能源发展介绍了直接甲醇燃料电池催化剂的制备与表征。采用液相还原取代法制备铂纳米管，通过XRD、TEM、XPS对材料进行形貌和结构表征，并以氢氧化钾溶液为电解质测试铂纳米管催化剂的电化学性能。通过开设该实验，不仅让学生了解直接甲醇燃料电池关键催化剂制备的实验原理、合成方法及数据分析，还可以更好地锻炼学生综合实验的操作技能，在培养研究兴趣的同时提升创新思维和创新能力。     

有机体系中电合成纳米PbTiO3粉体及表征

The precursor PbTi(OCH₂CH₃)_6-y(acac)_y for the mixed oxide PbTiO₃was synthesized by electrochemical dissolution of Lead and Titanium with a 1∶2 electricity quality in ethanol and acetyl-acetone solution. Nano-sized PbTiO₃powder was prepared by drying and calcining the xerogel from a direct sol-gel hydrolyzation of the precursor solution under pH of 8.5. The FTIR, TG-DTA, XRD and TEM were employed to characterize the structure of the precursor and nano-sized PbTiO₃. The results showed that the optimized conditions for the preparation of nano-sized PbTiO₃ were the electrolysis of the Lead plate and Titanium plate at 50 ℃ and 40 ℃ respectively under 0.03mol·dm^-3Bu₄NBr solution. The nano-sized PbTiO₃prepared by electrolysis exhibited a dispersive structure with an average diameter of 10 to 15 nm.     

Design of a Silicon Beam Resonator for a Novel Gas Sensor

研究了一种基于硅悬臂梁谐振器的新型气体传感器.该传感器在敏感环境中,可同时获得敏感膜电导率和质量变化,测量被测气体分子的荷质比,具有高灵敏度和高选择性.根据这一原理,针对气体传感器的需求,设计了硅悬臂梁谐振器化学传感器结构,进行了仿真优化,并采用MEMS表面牺牲层工艺制备该器件,激光频率仪测量验证了该微型谐振梁的谐振频率.     

MEMS器件的腐蚀与释放

以硅微机械FP腔器件为代表，该器件采用了标准的硅表面加工工艺，分析了此类具有悬空结构的MEMS器件在进行牺牲层的腐蚀和最终的结构释放过程中的各种问题. 根据所遇到问题的不同情况对器件的设计和工艺流程进行了改进，并通过实验验证了其可行性.     

Fluidic Infiltrative Assembly of 3D Hydrogel with Heterogeneous Composition and Function

3D hydrogels are powerful, multifunctional materials that are poised to become a building block in next-generation systems. Modern schemes to print complex 3D hydrogels are advancing rapidly; however, they possess several limitations including—but not limited to—polymer incompatibility or difficulty in imparting continuous heterogeneity in composition or function. Here, a simple strategy of synthesizing programmable hydrogel systems with tunable form and function in 3D is presented. This approach utilizes commercially available stereolithographic printer/resin to fabricate high-resolution molds followed by the programmed infiltration and gelation of hydrogel prepolymer. This mold is then sacrificed to yield 3D, multifunctional hydrogels exhibiting user-defined heterogeneity. The approach is compatible with numerous in-situ gelling polymers and modifiers ranging from interpenetrating networks of organic or synthetic polymers to functional materials possessing dense concentrations of nanomaterials or fluorescent markers. Accessible and versatile, this approach allows the fabrication of complex, multimaterial constructs with tunable 3D environmental responses inaccessible to well-established hydrogel 3D printing methods.     

基于硅悬臂梁谐振器的新型气体传感器

研究了一种基于硅悬臂梁谐振器的新型气体传感器.该传感器在敏感环境中,可同时获得敏感膜电导率和质量变化,测量被测气体分子的荷质比,具有高灵敏度和高选择性.根据这一原理,针对气体传感器的需求,设计了硅悬臂梁谐振器化学传感器结构,进行了仿真优化,并采用MEMS表面牺牲层工艺制备该器件,激光频率仪测量验证了该微型谐振梁的谐振频率.     

A novel way of texturing glass for microcrystalline silicon thin film solar cells application

In this paper, we present a novel way of texturing glass facilitated by ZnO:Al thin film as sacrificial layer for thin film silicon solar cell application. We name this technique zinc oxide‐induced texturing (ZIT). The texturing of glass was achieved by wet etching of ZnO:Al covered glass with HF and HNO₃ as etchants. We investigated the influence of the ZnO:Al layer sputtering condition, the layer thickness, and the etchant composition on the surface morphology of the textured glass. We demonstrate that we are able to control the roughness of the ZIT glass over a wide roughness range, ranging from 20 to 400 nm. Highly efficient microcrystalline silicon n‐i‐p solar cells were deposited on ZIT glass. The influence of the substrate morphology on the solar cell performance is also discussed. The highest efficiency for a single junction n‐i‐p microcrystalline silicon solar cell obtained in this work is 10.64% (Active area). Copyright © 2014 John Wiley & Sons, Ltd.