CAJ | 학술논문

以缓慢的水热合成法制备聚乙二醇(PEG)包覆的银纳米线,并用电子显微镜对其微观形貌和结构进行了表征.PEG是一种对银表面呈弱亲和性的水溶性聚合物,它在银纳米线合成中既作为Ag~+的还原剂,又作为银线的包覆剂.扫描电镜和透射电镜表征显示,这种银纳米线的直径为80～300 nm,长度大于100 μm;并且其中一部分银纳米线首尾相接形成了闭合纳米线圈,是首例以化学法制取的金属闭合纳米线圈.闭合环状纳米线的形成进一步支持了金属纳米线的融合生长机制.透射电镜和选区电子衍射以及银纳米线横截面切片的透射电镜表征显示,这种PEG包覆的银纳米线具有轴对称的五重挛晶结构.银纳米线经过长时间的水热孵化而保持其五重挛晶结构,这一点与某些文献报道的情况有所不同,说明银纳米线结构及其演化具有一定的复杂性.
이완만적수열합성법제비취을이순(PEG)포복적은납미선,병용전자현미경대기미관형모화결구진행료표정.PEG시일충대은표면정약친화성적수용성취합물,타재은납미선합성중기작위Ag~+적환원제,우작위은선적포복제.소묘전경화투사전경표정현시,저충은납미선적직경위80～300 nm,장도대우100 μm;병차기중일부분은납미선수미상접형성료폐합납미선권,시수례이화학법제취적금속폐합납미선권.폐합배상납미선적형성진일보지지료금속납미선적융합생장궤제.투사전경화선구전자연사이급은납미선횡절면절편적투사전경표정현시,저충PEG포복적은납미선구유축대칭적오중련정결구.은납미선경과장시간적수열부화이보지기오중련정결구,저일점여모사문헌보도적정황유소불동,설명은납미선결구급기연화구유일정적복잡성.
Poly(ethylene glycol)(PEG) coated silver nanowires has been hydrothermally prepared at a very slow rate, in which PEG was used as both a mild capping agent and a weak reductant. As-prepared silver nanowires(SNWs) have been characterized using scanning electron microscopy) and transmission electron microscope), which showed that the SNWs are usually longer than 100 μm and their diameters(each SNW has a uniform thickness) vary mainly in the range of 80～300 nm. Surprisingly, some of these silver nanowires connected) by their two ends to form some close-looped silver nanowires, which hitherto has not been reported elsewhere. The existence of close-looped silver nanowires supports the mechanism that nanowires can evolve from fusion of some nanoparticles and/or shorter nanorods. Careful TEM characterization and selected area electron) diffraction revealed that the silver nanowires kept a five-fold twinned structure, which is opposite to some reports) that a long-time incubation will lead to the disappearance of this twin structure. This work demonstrates the situation that deeper investigation is still needed for understanding the structure transformation of silver) nanowires.