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Sensors (Basel). 2018 May 6;18(5). pii: E1448. doi: 10.3390/s18051448.

Centrifugal Deposited Au-Pd Core-Shell Nanoparticle Film for Room-Temperature Optical Detection of Hydrogen Gas.

Author information

1
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China. songhan@whut.edu.cn.
2
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China. lzjyingying@163.com.
3
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China. lmylyf@126.com.
4
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. zhanggang@hust.edu.cn.
5
School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. pengwang@hust.edu.cn.
6
School of Engineering, Griffith University, Nathan, QLD 4222, Australia. mr_williamw@hotmail.com.
7
School of Engineering, Griffith University, Nathan, QLD 4222, Australia. y.zhu@griffith.edu.au.

Abstract

In the present work, centrifugal deposited Au-Pd core-shell nanoparticle (NP) film was proposed for the room-temperature optical detection of hydrogen gas. The size dimension of 44, 48, 54, and 62 nm Au-Pd core-shell nanocubes with 40 nm Au core were synthesized following a solution-based seed-mediated growth method. Compared to a pure Pd NP, this core-shell structure with an inert Au core could decrease the H diffusion length in the Pd shell. Through a modified centrifugal deposition process, continues film samples with different core-shell NPs were deposited on 10 mm diameter quartz substrates. Under various hydrogen concentration conditions, the optical response properties of these samples were characterized by an intensity-based optical fiber bundle sensor. Experimental results show that the continues film that was composed of 62 nm Au-Pd core-shell NPs has achieved a stable and repeatable reflectance response with low zero drift in the range of 4 to 0.1% hydrogen after a stress relaxation mechanism at first few loading/unloading cycles. Because of the short H diffusion length due to the thinner Pd shell, the film sample composed of 44 nm Au-Pd NPs has achieved a dramatically decreased response/recovery time to 4 s/30 s. The experiments present the promising prospect of this simple method to fabricate optical hydrogen sensors with controllable high sensitivity and response rate at low cost.

KEYWORDS:

Au-Pd core-shell nanoparticles; centrifugal deposition; nanoparticles film; optical fiber hydrogen sensor

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