Miniaturized pH Sensors Based on Zinc Oxide Nanotubes/Nanorods
Open Access
- 9 November 2009
- Vol. 9 (11), 8911-8923
- https://doi.org/10.3390/s91108911
Abstract
ZnO nanotubes and nanorods grown on gold thin film were used to create pH sensor devices. The developed ZnO nanotube and nanorod pH sensors display good reproducibility, repeatability and long-term stability and exhibit a pH-dependent electrochemical potential difference versus an Ag/AgCl reference electrode over a large dynamic pH range. We found the ZnO nanotubes provide sensitivity as high as twice that of the ZnO nanorods, which can be ascribed to the fact that small dimensional ZnO nanotubes have a higher level of surface and subsurface oxygen vacancies and provide a larger effective surface area with higher surface-to-volume ratio as compared to ZnO nanorods, thus affording the ZnO nanotube pH sensor a higher sensitivity. Experimental results indicate ZnO nanotubes can be used in pH sensor applications with improved performance. Moreover, the ZnO nanotube arrays may find potential application as a novel material for measurements of intracellular biochemical species within single living cells.Keywords
This publication has 34 references indexed in Scilit:
- ZnO Nanorods Based Hydrazine SensorsJournal of Nanoscience and Nanotechnology, 2009
- Highly-sensitive cholesterol biosensor based on well-crystallized flower-shaped ZnO nanostructuresTalanta, 2009
- Ultra-sensitive hydrazine chemical sensor based on high-aspect-ratio ZnO nanowiresTalanta, 2009
- Carbon-decorated ZnO nanowire array: A novel platform for direct electrochemistry of enzymes and biosensing applicationsElectrochemistry Communications, 2009
- Ultra-sensitive cholesterol biosensor based on low-temperature grown ZnO nanoparticlesElectrochemistry Communications, 2009
- The effect of the interlayer design on the electroluminescence and electrical properties of n-ZnO nanorod/p-type blended polymer hybrid light emitting diodesNanotechnology, 2009
- Novel hydrogen gas sensor based on single ZnO nanorodMicroelectronic Engineering, 2008
- Bending flexibility, kinking, and buckling characterization of ZnO nanorods/nanowires grown on different substrates by high and low temperature methodsJournal of Applied Physics, 2008
- Buckling and mechanical instability of ZnO nanorods grown on different substrates under uniaxial compressionNanotechnology, 2008
- Excitonic effects in ZnO nanowires and hollow nanotubesPublished by SPIE-Intl Soc Optical Eng ,2007