Spontaneous Room Temperature Elongation of CdS and Ag2S Nanorods via Oriented Attachment
Spontaneous Room Temperature Elongation of CdS and Ag2S Nanorods via Oriented Attachment
复制标题
DOI：
10.1021/ja902860t
复制
发表时间：
2009-09-02
影响因子：
15
通讯作者：
Ryan, Kevin M.
中科院分区：
文献类型：
--
作者：
O'Sullivan, Catriona;Gunning, Robert D.;Ryan, Kevin M.
据报道，在胺的存在下，硫化镉和硫化银的纳米晶体（从CdS交换阳离子）从纳米棒自发延伸到纳米线。当最终宽高比是原始纳米棒长度的可控倍数时，伸长率会立即发生。透射电镜（TEM）分析表明，影响吸附过程的因素有胺的浓度、反应时间和反应温度。通过x射线衍射（XRD）、光致发光（PL）、紫外可见光谱（UV-vis）和x射线光电子能谱（XPS）对纳米棒进行了进一步的表征。定向附着机制的证据是，不对称的金尖端CdS纳米棒的长度增加了一倍，而对称尖端的纳米棒没有相应的延伸。
Spontaneous elongation from nanorod to nanowire in the presence of an amine is reported for nanocrystals of cadmium sulfide and silver sulfide (cation exchanged from CdS). Elongation occurs instantaneously where the final aspect ratio is a controllable multiple of the original nanorod length. Transmission electron microscopy (TEM) analysis reveals the influential factors on the attachment process are the concentration of amine, duration and temperature of the reaction. The elongated nanorods are further characterized by X-ray diffraction (XRD), photoluminescence (PL), ultraviolet-visible spectroscopy (UV-vis) and X-ray photoelectron spectroscopy (XPS). A mechanism of oriented attachment is evidenced by the doubling in length of asymmetrically gold tipped CdS nanorods with the corresponding absence of elongation in symmetrically tipped nanorods.