期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 182, 期 -, 页码 147-155出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.02.064
关键词
Piezoelectric cantilever sensor; Dimethyl methylphosphonate
资金
- National Science Foundation (NSF) [CHE-0442100]
- National Institute of Health (NIH) [R01 EB00720]
- Nanotechnology Institute, a University Grant program of the Commonwealth of Pennsylvania's Ben Franklin Technology Development Authority through Ben Franklin Technology Partners of Southeast Pennsylvania grant
We have examined the detection of dimethyl methylphosphonate (DMMP) using lead magnesium niobate-lead titanate (PMN-PT) piezoelectric microcantilever sensor (PEMS) coated with various planar and particulate receptor coatings. We showed that a two-order-of-magnitude enhancement in the flexural-mode resonance frequency shift, Delta f, in DMMP detection that was not accountable for by mass loading alone could be achieved by using a planar Cu2+ adsorbed 11-Mercaptoundecanoic Acid (MUA/Cu2+) or planar 3-mercaptopropyltrimethoxysilane (MPS) coated PEMS. We also showed that the enhancement of Delta f of PEMS was a result of the Young's modulus change in the PMN-PT layer induced by the surface stress generated by the binding of DMMP on a continuous receptor coating. Furthermore, the Young's modulus-change enhanced Delta f in PEMS with a planar receptor coating was shown to be inversely proportional to the product of the average Young's modulus and thickness of the PEMS and independent of the PEMS lateral dimension. We also showed that with an array of three PEMS, one uncoated, one coated with planar MUA/Cu2+ and the other with planar MPS, the detection Delta f pattern for DMMP was distinctively different from those of acetone and ammonia. (C) 2013 Elsevier B.V. All rights reserved.
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