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Ultra-sensitive detection of zinc oxide nanowires using a quartz crystal microbalance and phosphoric acid DNA

Authors
Jang, KuewhanYou, JuneseokPark, ChanhooPark, HyunjunChoi, JaeyeongChoi, Chang-HwanPark, JinsungLee, HowonNa, Sungsoo
Issue Date
9-9월-2016
Publisher
IOP PUBLISHING LTD
Keywords
zinc oxide nanowires (ZnO NWs); quartz cyrstal microbalance (QCM); DNA; detection; in-situ
Citation
NANOTECHNOLOGY, v.27, no.36
Indexed
SCIE
SCOPUS
Journal Title
NANOTECHNOLOGY
Volume
27
Number
36
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/87532
DOI
10.1088/0957-4484/27/36/365501
ISSN
0957-4484
Abstract
Recent advancements of nanomaterials have inspired numerous scientific and industrial applications. Zinc oxide nanowires (ZnO NWs) is one of the most important nanomaterials due to their extraordinary properties. However, studies performed over the past decade have reported toxicity of ZnO NWs. Therefore, there has been increasing demand for effective detection of ZnO NWs. In this study, we propose a method for the detection of ZnO NW using a quartz crystal microbalance (QCM) and DNA probes. The detection method is based on the covalent interaction between ZnO NWs and the phosphoric acid group of single-stranded DNA (i.e., linker DNA), and DNA hybridization between the linker DNA and the probe DNA strand on the QCM electrode. Rapid, high sensitivity, in situ detection of ZnO NWs was demonstrated for the first time. The limit of detection was 10-4 mu g ml(-1) in deionized water, which represents a sensitivity that is 100000 times higher than the toxic ZnO NW concentration level. Moreover, the selectivity of the ZnO NW detection method was demonstrated by comparison with other types of nanowires and the method was able to detect ZnO NWs in tap water sensitively even after stored for 14 d in a refrigerator. The performance of our proposed method was sufficient to achieve detection of ZnO NW in the 'real-world' environment.
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공과대학 (기계공학부)
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