Zinc oxide nanorods grown on two-dimensional macroporous periodic structures and plane Si as a pH sensor

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作者
Al-Hilli, Safaa M. [1 ]
Al-Mofarji, R.T. [1 ]
Klason, P. [1 ]
Willander, M. [1 ]
Gutman, N. [2 ]
Sa'Ar, A. [2 ]
机构
[1] Department of Physics, Göteborg University, SE-41296, Göteborg, Sweden
[2] Racah Institute of Physics, Center for Nanoscience and Nanotechnology, Hebrew University of Jerusalem, Jerusalem 91904, Israel
来源
Journal of Applied Physics | 2008年 / 103卷 / 01期
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pH determination is a strong prerequisite for many biochemical and biological processes. We used two methods; namely; the electrochemical potential method (experimental) and site binding method (theoretical); to study the sensitivity of zinc oxide (ZnO) nanorods grown on two-dimensional macroporous periodic structures (2DMPPS) (p -and n -type) and plane n -type Si substrates for use as an intracellular pH sensing device. The dimension of these nanorods varied in radius between 50 and 300 nm and lengths of 1-10 μm. We found that the sensitivity of ZnO nanorods increases with reductions in size; from 35 mV/pH for D=300 nm and L=10 μm; to 58 mV/pH for D=50 nm and L=1 μm; using the site binding model. The experimental electrochemical potential difference for the ZnO nanorods working electrode versus Ag/AgCl reference electrode showed a high sensitivity range for ZnO nanorods grown on 2DMPPS n -Si substrate as compared to plane n -Si at room temperature for pH ranging from 4 to 12 in buffer and NaCl solutions. © 2008 American Institute of Physics;
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