Hierarchical ZnO Nanosheet-Nanorod Architectures for Fabrication of Poly(3-hexylthiophene)/ZnO Hybrid NO2 Sensor

Jing Wang, Xian Li, Yi Xia, Sridhar Komarneni, Haoyuan Chen, Jianlong Xu, Lan Xiang, Dan Xie

Research output: Contribution to journalArticle

67 Scopus citations

Abstract

A facile one-step solution method has been developed here to fabricate hierarchical ZnO nanosheet-nanorod architectures for compositing with poly(3-hexylthiophene) (P3HT) for fabricating a hybrid NO2 sensor. The hierarchical ZnO nanosheet-nanorod architectures were controllably synthesized by aging the solutions containing 0.05 mol·L-1 Zn2+ and 0.33 mol·L-1 OH- at 60 °C through a metastable phase-directed mechanism. The concentration of OH- played a huge role on the morphology evolution. When the [OH-] concentration was decreased from 0.5 to 0.3 mol·L-1, the morphology of the ZnO nanostructures changed gradually from monodispersed nanorods (NR) to nanorod assemblies (NRA), and then to nanosheet-nanorod architectures (NS-NR) and nanosheet assemblies (NSA), depending on the formation of various metastable, intermediate phases. The formation of NS-NR included the initial formation of ZnO nanosheets/γ-Zn(OH)2 mixed intermediates, followed by the dissolution of Zn(OH)2, which served as soluble zinc source. Soluble Zn(OH)2 facilitated the dislocation-driven secondary growth of ZnO nanorod arrays on the primary defect-rich nanosheet substrates. Hybrid sensors based on composite films composed of P3HT and the as-prepared ZnO nanostructures were fabricated for the detection of NO2 at room temperature. The P3HT/ZnO NS-NR bilayer film exhibited not only the highest sensitivity but also good reproducibility and selectivity to NO2 at room temperature. The enhanced sensing performance was attributed to the formation of the P3HT/ZnO heterojunction in addition to the enhanced adsorption of NO2 by NS-NR ZnO rich in oxygen-vacancy defects.

Original languageEnglish (US)
Pages (from-to)8600-8607
Number of pages8
JournalACS Applied Materials and Interfaces
Volume8
Issue number13
DOIs
StatePublished - Apr 20 2016

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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