在室温条件下，通过紫外光诱导方法在 n 型单晶硅表面成功地生长出长度为1.66~5.80μm、宽度为1.27~2.84μm、厚度在0.24~0.73μm之间变化的铜微纳米粒子。采用电子显微镜（SEM）观察到单个铜粒子表面光滑，并出现数个粒子聚集形成K或L...在室温条件下，通过紫外光诱导方法在 n 型单晶硅表面成功地生长出长度为1.66~5.80μm、宽度为1.27~2.84μm、厚度在0.24~0.73μm之间变化的铜微纳米粒子。采用电子显微镜（SEM）观察到单个铜粒子表面光滑，并出现数个粒子聚集形成K或L形状的粒子团聚现象。结果表明：改变溶液组分浓度和光照时间可以对铜微纳米粒子的尺寸和致密度进行有效控制。以浓度为1·10-5 mol/L罗丹明6G作探测分子，对制备的铜微纳米粒子薄膜的表面增强拉曼散射（SERS）效应进行研究，证实经过铜微纳米粒子修饰后的单晶硅对其表面吸附分子的拉曼信号确实有增强作用，这是因为铜粒子的表面等离子体效应能够提高样品表面局域场的电场强度。展开更多
A novel Pd electrocatalyst with flowerlike micro-nanostructures was synthesized by electrochemical deposition on a flexible graphene/polyimide（Gr/PI） composite membrane and characterized by scanning electron microsc...A novel Pd electrocatalyst with flowerlike micro-nanostructures was synthesized by electrochemical deposition on a flexible graphene/polyimide（Gr/PI） composite membrane and characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）.The Pd micro-nanoparticles were prepared on a COOH-CNTs/PI membrane as a comparative sample.The XRD and SEM investigations for Pd electrodeposition demonstrate that the particle size of Gr/PI composite membrane is smaller than that of COOH-CNTs/PI membrane,while the uniform and dense distribution of Pd micro-nanoparticles on the Gr/PI composite membrane is greater than that on the COOH-CNTs/PI membrane.The electrocatalytic properties of Pd/Gr/PI and Pd/COOH-CNTs/PI catalysts for the oxidation of formic acid were investigated by cyclic voltammetry（CV） and chronoamperometry（CA）.It is found that the electrocatalytic activity and stability of Pd/Gr/PI are superior to those of Pd/COOH-CNTs/PI catalyst.This is because smaller metal particles and higher dense distribution desirably provide abundant catalytic sites and mean higher catalytic activity.Therefore,the Pd/Gr/PI catalyst has better catalytic performance for formic acid oxidation than the Pd/COOH-CNTs/PI catalyst.展开更多
文摘在室温条件下，通过紫外光诱导方法在 n 型单晶硅表面成功地生长出长度为1.66~5.80μm、宽度为1.27~2.84μm、厚度在0.24~0.73μm之间变化的铜微纳米粒子。采用电子显微镜（SEM）观察到单个铜粒子表面光滑，并出现数个粒子聚集形成K或L形状的粒子团聚现象。结果表明：改变溶液组分浓度和光照时间可以对铜微纳米粒子的尺寸和致密度进行有效控制。以浓度为1·10-5 mol/L罗丹明6G作探测分子，对制备的铜微纳米粒子薄膜的表面增强拉曼散射（SERS）效应进行研究，证实经过铜微纳米粒子修饰后的单晶硅对其表面吸附分子的拉曼信号确实有增强作用，这是因为铜粒子的表面等离子体效应能够提高样品表面局域场的电场强度。
基金Project(51372106)supported by the National Natural Science Foundation of China
文摘A novel Pd electrocatalyst with flowerlike micro-nanostructures was synthesized by electrochemical deposition on a flexible graphene/polyimide（Gr/PI） composite membrane and characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）.The Pd micro-nanoparticles were prepared on a COOH-CNTs/PI membrane as a comparative sample.The XRD and SEM investigations for Pd electrodeposition demonstrate that the particle size of Gr/PI composite membrane is smaller than that of COOH-CNTs/PI membrane,while the uniform and dense distribution of Pd micro-nanoparticles on the Gr/PI composite membrane is greater than that on the COOH-CNTs/PI membrane.The electrocatalytic properties of Pd/Gr/PI and Pd/COOH-CNTs/PI catalysts for the oxidation of formic acid were investigated by cyclic voltammetry（CV） and chronoamperometry（CA）.It is found that the electrocatalytic activity and stability of Pd/Gr/PI are superior to those of Pd/COOH-CNTs/PI catalyst.This is because smaller metal particles and higher dense distribution desirably provide abundant catalytic sites and mean higher catalytic activity.Therefore,the Pd/Gr/PI catalyst has better catalytic performance for formic acid oxidation than the Pd/COOH-CNTs/PI catalyst.
