固相配位化学反应——ⅩⅩⅩ.室温下铁氰化钾的固相反应

本文首次报道了铁氰化钾在室温下与碘化钾、硫化钾的固相氧化还原反应,实验发现在固相下铁氰化钾与碘化钾混合后,生成单质碘和亚铁氰化钾,而在溶液中该反应是反方向进行的.实验还发现,在固相下铁氰化钾与还原剂硼氢化钠不反应,而在溶液中,该反应却能进行.对反应机制进行了初步探讨.     

线性变位极谱法研究 ⅩⅥ.铀(Ⅵ)—5—Br—PADAP—磺基水杨酸的配位吸附波

本文提出了铀(Ⅵ)-5-Br-PADAP-磺基水杨酸三元配合物的极谱配位吸附波。在pH为7.5-8.2的醋酸、三乙醇胺、乙醇底液中,该波的峰电位在-0.6855V(vs.SCE)。在1.00×10~(-7)-1.00×10~(-5)mol·dm~(-3)范围内,铀(Ⅵ)浓度与峰电流呈线性关系。对极谱波的电流、电位性质进行了研究,测定了配合物的组成、表观稳定常数和离解及生成速率常数。     

介电泳技术制备具有分子荧光增强效应的电极间纳米间隙结构

将单个核壳结构纳米颗粒放置在金属纳米电极之间制备了纳米尺度间隙结构.利用介电泳技术,本文可控地将蛋白质层包裹的SiO₂@Au核壳结构纳米颗粒定位放置在被荧光分子覆盖的纳米电极之间,从而得到了夹在纳米颗粒和金属纳米电极之间的纳米间隙结构.初步的光致发光测量表明,制备的纳米间隙结构可以有效地增强间隙中分子的荧光信号.这一结果为后续实现基于纳米间隙电极的电致分子荧光奠定了基础.     

两步化学气相沉积法制备In2Se3/MoSe2范德华尔斯异质结

Two-dimensional transition metal dichalcogenides heterostructures have stimulated wide interest not only for the fundamental research,but also for the application of next generation electronic and optoelectronic devices.Herein,we report a successful two-step chemical vapor deposition strategy to construct vertically stacked van der Waals epitaxial In₂Se₃/MoSe₂ heterostructures.Transmission electron microscopy characterization reveals clearly that the In₂Se₃ has well-aligned lattice orientation with the substrate of monolayer MoSe₂.Due to the interaction between the In₂Se₃ and MoSe₂ layers,the heterostructure shows the quenching and red-shift of photoluminescence.Moreover,the current rectification behavior and photovoltaic effect can be observed from the heterostructure,which is attributed to the unique band structure alignment of the heterostructure,and is further confirmed by Kevin probe force microscopy measurement.The synthesis approach via van der Waals epitaxy in this work can expand the way to fabricate a variety of two-dimensional heterostructures for potential applications in electronic and optoelectronic devices.     

铜表面抗氧化性能与其覆盖石墨烯的层数依赖关系研究

We studied the oxidation resistance of graphene-coated Cu surface and its layer dependence by directly growing monolayer graphene with different multilayer structures coexisted, di-minishing the influence induced by residue and transfer technology. It is found that the Cu surface coated with the monolayer graphene demonstrate tremendous difference in oxidation pattern and oxidation rate, compared to that coated with the bilayer graphene, which is considered to be originated from the strain-induced linear oxidation channel in monolayer graphene and the intersection of easily-oxidized directions in each layer of bilayer graphene, respectively. We reveal that the defects on the graphene basal plane but not the boundaries are the main oxidation channel for Cu surface under graphene protection. Our finding indi-cates that compared to putting forth efforts to improve the quality of monolayer graphene by reducing defects, depositing multilayer graphene directly on metal is a simple and effective way to enhance the oxidation resistance of graphene-coated metals.     

线性扫描伏安法研究(Ⅰ)——微盘电极上准稳态可逆波方程式及其验证

本文报道微盘电极上线性扫描伏安法准稳态可逆波方程式,并成功地进行了验证,理论和实验结果十分符合。     

基于氧化锌纳米颗粒-石墨烯异质结构的高性能紫外光探测器 (cited: 5)

报道了一种基于水热反应制备无表面活性剂的氧化锌纳米颗粒-还原石墨烯异质结构的新方法. 研究表明异质结构中氧化锌纳米晶体颗粒的平均直径为5 nm,这些颗粒均匀分布在还原石墨烯表面,其密度可以通过反应物的浓度进行有效调节. 并进一步构建了基于这种异质结构的光电探测器. 该探测器对紫外光的响应很快,光电流响应变化可达四个量级. 这些结果表明该异质结构特别适合作为替代材料用于设计和构建高性能的紫外光探测器件.     

基于DNA模板与聚二甲基硅氧烷转移制备钯纳米线的新方法

在聚二甲基硅氧烷衬底上梳理得到DNA阵列,并以DNA为模板通过低温乙醇还原得到Pd纳米线,再通过PDMS转移技术将Pd纳米线转移至不同的衬底,这是一种制备高导电性Pd纳米线的新方法.以DNA为模板的选择性生长控制方法可以显著抑制衬底上无规Pd纳米颗粒的出现. SEM观测制备的Pd纳米线的宽度约为80 nm,连续长度可达14 μm. FESEM、XPS和TEM表征揭示出Pd纳米线是由面心立方结构的Pd纳米晶粒组成,电学测量获得的Pd纳米线的电阻率为1.59 μΩm,仅比体电阻率高约一个量级. 研究还发现通过改变反应时间和温度可以有效调控Pd纳米线的生长过程.     

DNA在熵受限管道中穿越过程的计算机模拟

利用Metropolis Monte-Carlo动力学方法结合键长涨落算法，模拟了单链DNA分子在电场作用下穿越熵受限管道的动力学过程.结果表明，DNA分子穿越管道时将经历无规迁移、受限迁移及快速迁移等几个显著不同的阶段.平均迁移率随外场增加而增大并最终达到饱和值μ0，受限时间的对数与所加场强的倒数之间基本满足线性关系.模拟结果不仅与文献所给的实验结果基本一致，而且还可以提供实验不能直接观察到的DNA分子较为详细的穿越过程.