O'Mullane Anthony P, Neufeld Aaron K, Harris Alexander R, Bond Alan M
School of Chemistry, Monash University, P.O. Box 23, Victoria, 3800, Australia.
Langmuir. 2006 Dec 5;22(25):10499-505. doi: 10.1021/la060408v.
The electrochemical reduction of TCNQ to TCNQ*- in acetonitrile in the presence of [Cu(MeCN)4]+ has been undertaken at boron-doped diamond (BDD) and indium tin oxide (ITO) electrodes. The nucleation and growth process at BDD is similar to that reported previously at metal electrodes. At an ITO electrode, the electrocrystallization of more strongly adhered, larger, branched, needle-shaped phase I CuTCNQ crystals is detected under potential step conditions and also when the potential is cycled over the potential range of 0.7 to -0.1 V versus Ag/AgCl (3 M KCl). Video imaging can be used at optically transparent ITO electrodes to monitor the growth stage of the very large branched crystals formed during the course of electrochemical experiments. Both in situ video imaging and ex situ X-ray diffraction and scanning electron microscopy (SEM) data are consistent with the nucleation of CuTCNQ taking place at a discrete number of preferred sites on the ITO surface. At BDD electrodes, ex situ optical images show that the preferential growth of CuTCNQ occurs at the more highly conducting boron-rich areas of the electrode, within which there are preferred sites for CuTCNQ formation.
在掺硼金刚石（BDD）电极和氧化铟锡（ITO）电极上，已开展了在乙腈中，于[Cu(MeCN)₄]⁺存在的情况下，将TCNQ电化学还原为TCNQ⁻的研究。BDD电极上的成核和生长过程与先前在金属电极上报道的情况相似。在ITO电极上，在阶跃电位条件下以及当电位在相对于Ag/AgCl（3 M KCl）为0.7至 -0.1 V的电位范围内循环时，检测到了附着力更强、更大、呈分支状的针状I相CuTCNQ晶体的电结晶过程。视频成像可用于光学透明的ITO电极，以监测在电化学实验过程中形成的非常大的分支晶体的生长阶段。原位视频成像以及非原位X射线衍射和扫描电子显微镜（SEM）数据均表明，CuTCNQ的成核发生在ITO表面上数量有限的优选位点处。在BDD电极上，非原位光学图像显示，CuTCNQ的优先生长发生在电极中导电性更高的富硼区域，在这些区域内存在CuTCNQ形成的优选位点。
Zotero 插件