Enhanced mass sensitivity of ZnO nanorod-grown quartz crystal microbalances

被引：43

作者：

Lee, Dongkyu ^{[1
]}

Yoo, Myungsun ^{[1
]}

Seo, Hyejung ^{[1
]}

Tak, Youngjo ^{[1
]}

Kim, Wan-Gee ^{[1
]}

Yong, Kijung ^{[1
]}

Rhee, Shi-Woo ^{[1
]}

Jeon, Sangmin ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Dept Chem Engn, Pohang 790784, South Korea

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2009年 / 135卷 / 02期

关键词：

ZnO nanorod; Quartz crystal microbalance; DNA hybridization; Aptamer; MESOPOROUS SILICA FILMS; SOL-GEL PROCESS; SENSING CHARACTERISTICS; GAS; QCM; AMPLIFICATION; FABRICATION; SENSOR;

D O I：

10.1016/j.snb.2008.10.026

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

ZnO nanorods were directly grown on the surface of a quartz crystal in zinc nitrate hexahydrate solution. The nanorod dimensions were controlled by varying the growth time, from 0.6 mu m for a growth time of 1 h to 2.0 mu m after 3 h of growth. After sequentially coating the nanorod-grown quartz crystals with thin layers of titanium and gold by thermal evaporation, the crystals were exposed to mercaptohexanol solution and the frequency change due to mercaptohexanol adsorption was determined. The frequency change for the nanorod-grown quartz crystal was about 60 times greater than that of the corresponding plain gold-coated quartz crystal due to the increase in surface area afforded by the nanorods. A similar enhancement of mass sensitivity was observed for the immobilization and hybridization of oligonucleotides on the nanorod-grown crystals. Although for larger molecules the enhancement of mass sensitivity was degraded by steric hindrance, the results demonstrate the potential of ZnO nanorod-grown quartz crystals for use in DNA-based biosensor applications. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：444 / 448

页数：5

共 29 条

[1] Rapid detection of fibrinogen and fibrin degradation products using a smart QCM-sensor [J].