st quartz acoustic wave sensors with sectional guiding layers圣石英声波传感器与分段指导层.pdf

Sensors 2008, 8, 4384-4391; DOI: 10.3390/s8074384 OPEN ACCESS sensors ISSN 1424-8220 /sensors Communication ST Quartz Acoustic Wave Sensors with Sectional Guiding Layers Michael I. Newton, Paul Roach * and Glen McHale School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham. NG11 8NS. United Kingdom * Author to whom correspondence should be addressed; Email: Paul.Roach@ntu.ac.uk; Tel. +44(0)115-848-8062; Fax : +44(0)115-848-6616 Received: 10 June 2008; in revised version: 23 July 2008 / Accepted: 24 July 2008 / Published: 25 July 2008 Abstract: We report the effect of removing a section of guiding layer from the propagation paths of ST-quartz Love wave sensors; this offers the ease of fabrication of a polymer guiding layer whilst retaining the native surface of the quartz which may then be used for the attachment of a sensitizing layer. Data is presented for rigid and viscous loading, which indicates a small reduction in mass sensitivity compared to a Love wave device. Biosensing capabilities of these discontinuous ‘sectional’ guiding layer devices are demonstrated using protein adsorption from solution. Keywords: ST-quartz, Love wave, guiding layer, SAW, SH-SAW 1. Introduction Since the first reports of Love wave sensors on ST-quartz in 1992 [1, 2] there have been many investigations and applications of this system. Initial work used polymer guiding layers [1, 3, 4] with SiO later being used extensively. [5, 6] ST