An adsorption-based mercury sensor with continuous readout
- 265 Downloads
A novel readout procedure for a mercury sensor has been proposed. The sensor is based on the surface adsorption. Mercury vapor is adsorbed at the surface of a thin gold layer patterned into four meanders which are connected into a Wheatstone bridge configuration. Sensing is achieved by the resistivity change of the gold film during mercury adsorption. Direct output from the sensor is electric voltage. It takes an additional procedure to convert voltage to mercury concentration. This type of sensor is improved by introducing continuous readout procedure for the voltage–concentration conversion. By using this readout procedure it is possible to monitor mercury vapor concentration as a function of time. Readout is based on the Langmuir time–dependent adsorption theory. This paper illustrates a practical implementation of the new readout procedure.
KeywordsMercury Concentration Sensor Chip Mercury Vapor Wire Bonding Wheatstone Bridge
This work was supported by the Ministry of Education and Science of Republic of Serbia, Contract No. TR 32008 of 2011.
- Bakshi AV, Bakshi UA (2007) Electronic measurements and instrumentation. Technical Publications, PuneGoogle Scholar
- Butt HJ, Graf K, Kappl M (2006) Physics and chemistry of interfaces. Wiley, Berlin, pp 185–188Google Scholar
- EPA, EPA’s Roadmap for Mercury (2006) http://www.epa.gov/mercury. Accessed 31 May 2012
- EU, European Commission Directorate-General Environment Contract: ENV.G.2/ETU/2007/0021 (2008) Options for reducing mercury use in products and applications, and the fate of mercury already circulating in society Final ReportGoogle Scholar
- McNerney JJ, Buseck PR, Hanson RC (1972) Mercury detection by means of thin gold films. Sci New Ser 178(4061):611–612Google Scholar
- Mercury Instruments USA, http://www.mercury-instrumentsusa.com/TrackerIP.htm. Accessed 31 May 2012
- Pirrone N, Cinnirella S, Feng X, Finkelman RB, Friedli HR, Leaner J, Mason R, Mukherjee AB, Stracher G, Streets DG, Telmer K (2009) Global mercury emissions to the atmosphere from natural and anthropogenic sources. In: Pirrone N, Mason R (eds) Mercury fate and transport in the global atmosphere. Springer, Dordrecht, Heidelberg, London, New York, pp 3–50Google Scholar
- Schambach K, Eden K, Schumacher K, Wiegleb G (2002) Micromachined Mercury sensor. Proceedings of the 32th European solid-state device Research Conference (ESSDERC 2002) 24–26 September 2002 Firenze, ItalyGoogle Scholar