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Selective growth of ZnO nanorods on microgap electrodes and their applications in UV sensors

Qazi Humayun1*, Muhammad Kashif1, Uda Hashim1 and Ahsanulhaq Qurashi23

Author Affiliations

1 Nano Biochip Research Group, Institute of Nano Electronic Engineering (INEE), Universiti Malaysia Perlis (UniMAP), Kangar, Perlis 01000, Malaysia

2 Center of Excellence in Nanotechnology, King Fahd University of Petroleum and Minerals Dhahran, Dhahran 31261, Saudi Arabia

3 Department of Chemistry, King Fahd University of Petroleum and Minerals Dhahran, Dhahran 31261, Saudi Arabia

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Nanoscale Research Letters 2014, 9:29  doi:10.1186/1556-276X-9-29

Published: 15 January 2014


Selective area growth of ZnO nanorods is accomplished on microgap electrodes (spacing of 6 μm) by using a facile wet chemical etching process. The growth of ZnO nanorods on a selected area of microgap electrode is carried out by hydrothermal synthesis forming nanorod bridge between two electrodes. This is an attractive, genuine, direct, and highly reproducible technique to grow nanowire/nanorod onto the electrodes on selected area. The ZnO nanorods were grown at 90°C on the pre-patterned electrode system without destroying the electrode surface structure interface and geometry. The ZnO nanorods were tested for their application in ultraviolet (UV) sensors. The photocurrent-to-dark (Iph/Id) ratio was 3.11. At an applied voltage of 5 V, the response and recovery time was 72 and 110 s, respectively, and the response reached 2 A/W. The deposited ZnO nanorods exhibited a UV photoresponse that is promising for future cost-effective and low-power electronic UV-sensing applications.

Wet etching; ZnO nanorods; Microgap; Photocurrent; Photoresponse; Low-power UV sensor