On a Schottky diode-type hydrogen sensor with pyramid-like Pd nanostructures

被引：15

作者：

Chou, Po-Cheng ^{[1
]}

Chen, Huey-Ing ^{[2
]}

Liu, I-Ping ^{[2
]}

Chen, Wei-Cheng ^{[1
]}

Chen, Chun-Chia ^{[1
]}

Liou, Jian-Kai ^{[1
]}

Lai, Cheng-Jing ^{[1
]}

Liu, Wen-Chau ^{[1
]}

机构：

[1] Natl Cheng Kung Univ, Dept Elect Engn, Inst Microelect, Tainan 70101, Taiwan

[2] Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2015年 / 40卷 / 29期

关键词：

Schottky diode; Pd nanostructure; Hydrogen sensor; Pyramid-like Pd nanostructure; Polystyrene nanosphere (PS NS); Transient response; SENSING CHARACTERISTICS; GAS SENSORS; PERFORMANCE; ALGAN/GAN; TEMPERATURE;

D O I：

10.1016/j.ijhydene.2015.05.036

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：

A new Pd/AlGaN/GaN Schottky diode-type hydrogen sensor with pyramid-like Pd nanostructures is fabricated and studied comprehensively. The employed pyramid-like Pd nanostructures cause the substantial increase of surface roughness and surface-to-volume aspect ratio which give the remarkable increase of adsorption sites on the surface for hydrogen molecules. Experimentally, the studied device with pyramid-like Pd nanostructures demonstrates enhanced hydrogen sensing performance, including a large forward-bias current variation of 1.95 x 10(-6) A and a high sensing response of 1454 under an introduced 1% H-2/air gas at 300 K. These properties are remarkably superior to those of the conventional planar-surface device. In addition, an improved hydrogen detection limit of 10 ppb H-2/air at 300 K is found for the studied device with pyramid-like Pd nanostructures. The related hydrogen sensing characteristics including transient responses and steady-state analysis are also studied in this work. Therefore, based on the improved sensing properties and advantages of low-cost, easy fabrication, and solid stability of operation, the studied device shows the promise for high-performance hydrogen sensing applications. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：9006 / 9012

页数：7

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