Multifunctional Ag nanoparticle decorated Si nanowires for sensing, photocatalysis and light emission applications

被引：39

作者：

Ghosh, Ramesh ^{[1
,2
,3
]}

Ghosh, Joydip ^{[1
]}

Das, Ruma ^{[1
]}

Mawlong, Larionette P. L. ^{[2
]}

Paul, Kamal Kumar ^{[1
]}

Giri, P. K. ^{[1
,2
]}

机构：

[1] Indian Inst Technol Guwahati, Dept Phys, Gauhati 781039, India

[2] Indian Inst Technol Guwahati, Ctr Nanotechnol, Gauhati 781039, India

[3] Seoul Natl Univ, Dept Phys & Astron, Seoul 151747, South Korea

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2018年 / 532卷

关键词：

Si nanowires; Ag nanoparticles; Photoluminescence; Photocatalysis; SERS; Chemical sensing; FREE GLUCOSE DETECTION; SILICON NANOWIRES; ENHANCED PHOTOLUMINESCENCE; ELECTRICAL-PROPERTIES; ENERGY-CONVERSION; ARRAY; GROWTH;

D O I：

10.1016/j.jcis.2018.07.123

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We report on the fabrication of Ag nanoparticle (NP) decorated mesoporous Si nanowire (NW) heterostructure (HS) by a simple and low cost chemical process. The as-grown Si NWs are mesoporous in nature and the Ag NP decorated Si NWs (Ag@Si NWs) exhibit broadband light emission, ultralow reflectance, efficient photocatalytic degradation of organic dyes and excellent sensitivity for the detection of organic molecules over a wide range of concentration. The broadband white light photoluminescence emission from the bare Si NWs is explained on the basis of quantum confinement effect in Si NCs/NWs and the nonbridging oxygen hole center defects in the Si-SiOx interface. High work function of the noble metal NPs facilitates the effective separation of the photoinduced electron-hole pairs in Si NWs, which enables the Ag@Si NWs to exhibit high photocatalytic efficiency for the degradation of organic dye. The Ag@Si NWs exhibited high potential and sensitivity for the selective and quantitative detection of different organic molecules at extremely low concentration down to 10(-12) M by surface-enhanced Raman scattering and 10(-11) M by fluorescence-based detection. These versatile properties of the Ag@Si NWs open up opportunities for a variety of energy and environmental applications, such as white light emission, solar cell, artificial photosynthesis, disposal of organic pollutant and bio-chemical sensors etc. (C) 2018 Elsevier Inc. All rights reserved.

引用

页码：464 / 473

页数：10

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