Ye Yixing, Wang Panpan, Dai Enmei, Liu Jun, Tian Zhenfei, Liang Changhao, Shao Guosheng
Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
Phys Chem Chem Phys. 2014 May 21;16(19):8801-7. doi: 10.1039/c4cp00554f.
Quantum-sized SnO2 nanocrystals can be well dispersed on reduced graphene oxide (rGO) nanosheets through a convenient one-pot in situ reduction route without using any other chemical reagent or source. Highly reactive metastable tin oxide (SnO(x)) nanoparticles (NPs) were used as reducing agents and composite precursors derived by the laser ablation in liquid (LAL) technique. Moreover, the growth and phase transition of LAL-induced SnO(x) NPs and graphene oxide (GO) were examined by optical absorption, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy and high-resolution transmission electron microscopy. Highly dispersed SnO(x) NPs can also prevent rGO from being restacked into a multilayer structure during GO reduction. Given the good electron transfer ability and unsaturated dangling bonds of rGO, as well as the ample electrocatalytic active sites of quantum-sized SnO2 NPs on unfolded rGO sheets, the fabricated SnO2-rGO nanocomposite exhibited excellent performance in the non-enzymatic electrochemical detection of glucose molecules. The use of LAL-induced reactive NPs for in situ GO reduction is also expected to be a universal and environmentally friendly approach for the formation of various rGO-based nanocomposites.
通过便捷的一锅原位还原路线，无需使用任何其他化学试剂或源，量子尺寸的二氧化锡（SnO₂）纳米晶体就能很好地分散在还原氧化石墨烯（rGO）纳米片上。高反应活性的亚稳态氧化锡（SnO(x)）纳米颗粒（NPs）用作还原剂和通过液相激光烧蚀（LAL）技术衍生的复合前驱体。此外，通过光吸收、X射线衍射、X射线光电子能谱、拉曼光谱和高分辨率透射电子显微镜研究了LAL诱导的SnO(x) NPs和氧化石墨烯（GO）的生长及相变。高度分散的SnO(x) NPs还能防止rGO在GO还原过程中重新堆叠成多层结构。鉴于rGO良好的电子转移能力和不饱和悬键，以及未折叠的rGO片上量子尺寸的SnO₂ NPs丰富的电催化活性位点，制备的SnO₂-rGO纳米复合材料在葡萄糖分子的非酶电化学检测中表现出优异性能。利用LAL诱导的反应性NPs原位还原GO也有望成为一种通用且环保的方法来形成各种基于rGO的纳米复合材料。
