纳米硫化镉在对氨基苯硫酚自组装单层修饰金电极上的电化学合成.pdf

物理化学学报( Wuli Huaxue Xuebao)
1398
Acta Phys.- Chin.Sin.2012,28(6),1398-1404
June
Article
doi:10.3866/PKU.WHXB201204091
www.whxb.pku.cdu.cn
纳米硫化镉在对氨基苯硫酚自组装单层修饰金电极上的电化学合成
E:慧2席燕燕周剑章2”林仲华2
(厦门大学固体表面物理化学国家重点实验室,福建厦门361005;2厦门大学化学化工学院化学系,福建厦门361005
中国石油大学(华东)重质油国家重点实验室,山东青岛26655
摘要:采用电流脉冲法在自组装了对氨基苯硫酚单层的金电极(PATP/Au)上电沉积硫化镉(CdS)纳米溥膜,运
用扫描电子显微镜(SEM)和X射线行射谱(XRD)对其形貌和结构进行了表征,发现得到的是垂直基底生长的
CdS纳米棒有序阵列.研究电沉积中电流脉冲参数的影响肘发现:随着电流脉冲宽度增大,CdS纳米棒的尺寸
增大,有序性降低;脉冲幅度增大,则纳米棒尺寸增大,覆盖度也随之增大.因此通过调节脉冲宽度和脉冲幅
度,可对所制备的CdS纳米薄膜的形貌和尺寸进行调控.运用循环伏安法和计时电位法对电沉积机理进行了
探究.根据实验结果我们认为Au电极自组装PATP单分子层后,PATP分子中的一NH2与溶液中Cd2'相互作用,
使沉积时的电子通过表面的PATP分子链进行传递.并进一步提出纳米CdS在PATP/Au电敝上电化学合成的
生长机埋
关键词:电流脉冲法;硫化锔;对氨基苯硫;形貌调控;纳米薄煐;纳米棒
中图分类号:O646
Electrochemical Synthesis of Cds Nanocrystals on a Gold Electrode
Modified with a -Aminothiophenol Self-assembled Monolayer
WANG Hui? XI Yan-yai
ZHOU JianZhang
LIN Zhong-hua
State Key Laboratory of Physical Chemistry of Solid Surfaces, imen University, Xiamen 36100.5, Fwjian Province, P R China
Department ofchemistry College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005
Fujian Province, P R. China; State Key Laboratory of Heavy Oil Processing, China University of Petroleum,
Oingdao 266555, Shandong Province, P R China
Abstact: T s ok esi es the lerema thesis of cadmium sulfide( CS)nanostructured
films by applying a pulsed current technique on the gold electrode modified with a self-assembled
p-aminothiophenol monolayer(PAP/A). canning electron microscopy (SEM and X-ray diffraction
(RD were used to characterize the morphology and crystal phase of the synthesized samples. An
ordered array of Cds nanorods with a relatively higher c-axis preferred orientation was found on the PATP
Au substrate. The results indicated that the size of the Cds nanorods increased with the increase in the
pulse width of the pulsed current, whereas the uniformity decreased. Furthermore, the size and coverage
of the S nanorods increased with the increase in the pulse height. Thus, the morphology and size of th
prepared Cds nanorods could be controlled by adjusting the pulse width and height. Cyclic voltammet
CV and chronopotentiometry were also applied to investigate the mechanism of the electrodeposition of
Cds on PATP/Au. In accordance with the experimental results, we suggest that the interaction of THE-NH
in PATP molecules with C in the solution may have contributed to the passing of electrons along th
PATP chain ollowin a modiano of he -mino io enl monolayer on the Au substrate. A formation
mechanism for he electrochemically synthesized Cds nanorods on the PATP/Au substrate has
5, 2011; Revised: April 6, 2012; Published on Web: April 9, 2012
ponding author. Email: jzzhou(@
The project was supported by the National Natural Science Foundation of China(21021002, 20973134
国家门然科学基(21021002,20973134)资助项日
C Fditorial
Acta Ph