期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 36, 页码 33124-33131出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b09769
关键词
hydrothermal; porous GaN submicron rods; gas sensors; high temperature; high sensitivity
资金
- Shenzhen Science and Technology Innovation Committee [JCYJ20170412154426330, KQTD2015071710313656]
- Guangdong Natural Science Funds [2016A030306042, 2018A050506001]
- Guangdong Special Support Program [2015TQ01X555]
Highly porous GaN submicron rods have been synthesized successfully by a facile hydrothermal method and heat treatment under controlled atmosphere. The morphology and size of the hydrothermal products are tailorable by adjusting the concentration of precursor solutions. Upon calcination in air, the nanorod-assembled GaOOH submicron rods are converted into bundlelike Ga2O3 and into porous GaN submicron rods under an ammonia flow. Gas-sensing characterization demonstrates that the sensors based on porous GaN exhibit high sensitivity and fast response to ethanol vapor, as well as excellent stability and reliability at high temperature. The highly porous GaN submicron rods with a large specific surface area, small grain size, and high length-to-diameter ratio show better response to ethanol. A possible sensing enhancement mechanism is also proposed. This study provides a promising route for the novel synthesis of GaN submicron rods for high-performance gas sensors.
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