碳纳米球的紫外光致发光及其表面等离子体诱导增强。

Ultraviolet Photoluminescence of Carbon Nanospheres and its Surface Plasmon-Induced Enhancement.

机构信息

Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physics and Technology, Nanjing Normal University, Nanjing, 210023, China.

Key Lab of Advanced Transducers and Intelligent Control Systems, Ministry of Education and Shanxi Province, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, China.

出版信息

Small. 2018 Apr;14(16):e1704239. doi: 10.1002/smll.201704239. Epub 2018 Mar 25.

DOI:10.1002/smll.201704239

PMID:29575595

Abstract

Ultraviolet (UV) light can be used in versatile applications ranging from photoelectronic devices to biomedical imaging. In the development of new UV light sources, in this study, stable UV emission at ≈350 nm is unprecedentedly obtained from carbon nanospheres (CNSs). The origin of the UV fluorescence is comprehensively investigated via various characterization methods, including Raman and Fourier transform infrared analyses, with comparison to the visible emission of carbon nanodots. Based on the density functional calculations, the UV fluorescence is assigned to the carbon nanostructures bonded to bridging O atoms and dangling -OH groups. Moreover, a twofold enhancement in the UV emission is acquired for Au-carbon core-shell nanospheres (Au-CNSs). This remarkable modification of the UV emission is primarily ascribed to charge transfer between the CNSs and the Au surface.

摘要

紫外线 (UV) 光在从光电设备到生物医学成像等各种应用中都有广泛的用途。在新型 UV 光源的开发中，本研究从碳纳米球 (CNSs) 中获得了前所未有的稳定 ≈350nm 的 UV 发射。通过包括拉曼和傅里叶变换红外分析在内的各种表征方法，以及与碳纳米点的可见光发射进行比较，全面研究了 UV 荧光的起源。基于密度泛函计算，将 UV 荧光分配给与桥接 O 原子和悬垂 -OH 基团结合的碳纳米结构。此外，Au-碳核壳纳米球 (Au-CNSs) 的 UV 发射增强了两倍。这种对 UV 发射的显著修饰主要归因于 CNSs 和 Au 表面之间的电荷转移。