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Silicon micro-levers and a multilayer graphene membrane studied via laser photoacoustic detection
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SYSNO ASEP 0443981 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Silicon micro-levers and a multilayer graphene membrane studied via laser photoacoustic detection Author(s) Zelinger, Zdeněk (UFCH-W) RID, ORCID
Janda, Pavel (UFCH-W) RID, ORCID
Suchánek, Jan (UFCH-W) RID, ORCID
Dostál, M. (CZ)
Kubát, Pavel (UFCH-W) RID, ORCID, SAI
Nevrlý, V. (CZ)
Bitala, P. (CZ)
Civiš, Svatopluk (UFCH-W) RID, ORCID, SAISource Title Journal of Sensors and Sensor Systems - ISSN 2194-8771
Roč. 4, č. 1 (2015), s. 103-109Number of pages 7 s. Language eng - English Country DE - Germany Keywords TRACE GAS-ANALYSIS ; MONOLAYER GRAPHENE ; CANTILEVER ARRAY Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GA14-14696S GA ČR - Czech Science Foundation (CSF) Institutional support UFCH-W - RVO:61388955 UT WOS 000364051800014 DOI 10.5194/jsss-4-103-2015 Annotation Laser photoacoustic spectroscopy (PAS) is a method that utilizes the sensing of the pressure waves that emerge upon the absorption of radiation by absorbing species. The use of the conventional electret microphone as a pressure sensor has already reached its limit, and a new type of microphone – an optical microphone – has been suggested to increase the sensitivity of this method. The movement of a micro-lever or a membrane is sensed via a reflected beam of light, which falls onto a position-sensing detector. The use of one micro-lever as a pressure sensor in the form of a silicon cantilever has already enhanced the sensitivity of laser PAS. Herein, we test two types of home-made sensing elements – four coupled silicon micro-levers and a multilayer graphene membrane – which have the potential to enhance this sensitivity further. Graphene sheets possess outstanding electromechanical properties and demonstrate impressive sensitivity as mass detectors. Their mechanical properties make them suitable for use as micro-/nano-levers or membranes, which could function as extremely sensitive pressure sensors. Graphene sheets were prepared from multilayer graphene through the micromechanical cleavage of basal plane highly ordered pyrolytic graphite. Multilayer graphene sheets (thickness ~102 nm) were then mounted on an additional glass window in a cuvette for PAS. The movements of the sheets induced by acoustic waves were measured using an He–Ne laser beam reflected from the sheets onto a quadrant detector. A discretely tunable CO2 laser was used as the source of radiation energy for the laser PAS experiments. Sensitivity testing of the investigated sensing elements was performed with the aid of concentration standards and a mixing arrangement in a flow regime. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2016
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