Journal
ACS NANO
Volume 7, Issue 8, Pages 6685-6690Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn4027245
Keywords
multichannel QCM; electrodeless QCM; ZnO nanostructures; quality factor; electronic nose
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Funding
- National Research Foundation of Korea (NRF)
- Ministry of Education [NRF-2011-0011246]
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An electrodeless monolithic multichannel quartz crystal microbalance (MQCM) sensor was developed via the direct growth of ZnO nanorod patterns of various sizes onto an electrodeless quartz crystal plate. The patterned ZnO nanorods acted as independent resonators with different frequencies upon exposure to an electric field. The added mass of ZnO nanostructures was found to significantly enhance the quality factor (QF) of the resonator in electrodeless QCM configuration. The QF increased with the length of the ZnO nanorods; ZnO nanorods 5 pm in length yielded a 7-fold higher OF compared to the OF of a quartz plate without ZnO nanorods. In addition, the ZnO nanorods offered enhanced sensitivity due to the enlarged sensing area. The developed sensor was used as an electronic nose for detection of vapor mixtures with impurities.
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