Synthesis of ZnO nanorod arrays on Zn substrates by a gas–solution–solid method and their application as an ammonia sensor

The design of the 1D nano-structured material arrays on substrates is required for the development of conductivity sensors. A simple method, the so-called gas–solution–solid, has been developed to prepare ZnO nanorod arrays on Zn substrate. The method consists of putting Zn foils above an ammonia so...

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Bibliographic Details
Published inJournal of materials science Vol. 49; no. 1; pp. 347 - 352
Main Authors Qiu, Yongfu, Yang, Minlin, Fan, Hongbo, Xu, Yongjun, Shao, Youyuan, Yang, Xiaoxi, Yang, Shihe
Format Journal Article
LanguageEnglish
Published Boston Springer US 2014
Springer
Springer Nature B.V
Subjects
Ammonia
Arrays
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Materials Science
Metal foils
Methods
Nanorods
Polymer Sciences
Reaction time
Room temperature
Sensitivity
Sensor arrays
Sensors
Solid Mechanics
Substrates
Zinc oxide
Increase Ammonia Concentration
Ammonia Solution
Conductivity Sensor
Nanorod Growth
Nanorod Array
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Summary:The design of the 1D nano-structured material arrays on substrates is required for the development of conductivity sensors. A simple method, the so-called gas–solution–solid, has been developed to prepare ZnO nanorod arrays on Zn substrate. The method consists of putting Zn foils above an ammonia solution for about 24 h to obtain the aligned ZnO nanorods on substrates. The sizes of ZnO nanorod arrays could be controlled by adjusting the concentration of the ammonia–water solution and reaction time. Moreover, the growth mechanism of the nanorod arrays was studied and proposed. In the proposed mechanism, the Zn source from the Zn foil is first oxidized to ZnO and Zn 2+ by oxygen. Then ZnO nanorod arrays are grown with the help of ammonia in the solution as a transporter of zinc ions. The nanorod arrays growth mechanism involves oxygen gas, ammonia solution, and Zn foil, and is, therefore, named as gas–solution–solid mechanism. Finally, the NH 3 sensing properties were measured and the results showed that ZnO nano-array sensor has high sensitivity and reversibility for NH 3 sensing at the room temperature and the sensitivity increases with increasing gas concentration. Graphical Abstract
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-013-7711-0