在碳纳米管片上一锅法合成金纳米板的新策略作为一种有效的柔性 SERS 基底。

Novel Strategy for One-Pot Synthesis of Gold Nanoplates on Carbon Nanotube Sheet As an Effective Flexible SERS Substrate.

机构信息

Department of Materials Science and Engineering, University of California, Los Angeles , 410 Westwood Plaza, Los Angeles, California 90095, United States.

Institute for Technology Advancement, University of California, Los Angeles , 410 Westwood Plaza, Los Angeles, California 90095, United States.

出版信息

ACS Appl Mater Interfaces. 2017 Feb 22;9(7):6246-6254. doi: 10.1021/acsami.6b10560. Epub 2017 Feb 7.

DOI:10.1021/acsami.6b10560

PMID:28106364

Abstract

In this work, we demonstrate a novel route for one-pot synthesis of two-dimensional gold nanoplates (2-D AuNPLs) on carbon nanotube (CNT) sheet. Well-defined AuNPLs are grafted onto CNT sheet via a facile hydrothermal reduction process, during which bromine ions are employed as the surfactant for gold anisotropic growth. Scanning electron microscopy (SEM) shows large-scale AuNPLs with micrometer-scaled length and sub-100 nm thickness are deposited uniformly on the CNT sheet. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) results confirm the synthesized AuNPLs are single-crystalline with preferential {111} orientation. Based on the CNT sheet/AuNPLs hybrid, we have fabricated a flexible surface-enhanced Raman scattering (SERS) substrate, which can effectively detect the analyte Rhodamine 6G (Rh6G) at the concentration as low as 1 × 10 M. The excellent SERS performance of this novel flexible substrate is mainly attributed to nanoscaled gaps between the neighbors, large surface area with roughness, and their sharp edges and corners.

摘要

在这项工作中，我们展示了一种在碳纳米管（CNT）片上一锅合成二维金纳米片（2-D AuNPLs）的新途径。通过简单的水热还原过程，将定义良好的 AuNPLs 接枝到 CNT 片上，在此过程中溴离子被用作金各向异性生长的表面活性剂。扫描电子显微镜（SEM）显示，大面积的 AuNPLs 具有微米级长度和亚 100nm 厚度，均匀地沉积在 CNT 片上。透射电子显微镜（TEM）和 X 射线衍射（XRD）结果证实合成的 AuNPLs 是具有择优 {111} 取向的单晶。基于 CNT 片/AuNPLs 杂化材料，我们制备了一种柔性表面增强拉曼散射（SERS）基底，可有效检测分析物 Rhodamine 6G（Rh6G），其浓度低至 1×10-7M。这种新型柔性基底的优异 SERS 性能主要归因于相邻纳米级间隙、大粗糙度表面积及其尖锐的边缘和拐角。