Wiriya Suwannet

Information about Wiriya Suwannet

Published on January 10, 2008

Author: Susann

Source: authorstream.com

Content

Homemade Quartz Crystal Microbalance Systems for Alcohol Sensor :  Homemade Quartz Crystal Microbalance Systems for Alcohol Sensor Present By Wiriya Suwannet1, Rawat Jaisutti1, Onanong Chamlek1, Orawan Jarubundit2, Panus Kuen-asa3, Khet Donprajam 4, Siripat Pratontep5, Teerakiat Kercharod1, Tanakorn Osotchan1 1Capability Building Unit for Nanoscience and Nanotechnology, Department of Physics, Faculty of Science, Mahidol University, Bangkok, 10400 2Department of Physics, Faculty of science, Prince of Songkla University 3Faculty of Science, Ubonratchatani Rajabhat University 4Faculty of Science and Technology, Mahasarakham Rajabhat University 5National Nanotechnology Center, Thailand Science Park,Patumtani,12120 Slide2:  Homemade Quartz Crystal Microbalance Systems for Alcohol Sensor I Introduction to Quartz Crystal Microbalance II Circuits and Measuring Systems III Results IV Conclusions Slide3:  Quartz Crystal Microbalance (QCM) I Introduction to Quartz Crystal Microbalance Quartz Crystal Microbalance (QCM) is well known tool for the determination of film thickness. QCM act by detecting a change in resonant frequency due to a change in mass deposited on the surface. When thin film is attached to the crystal the frequency decreases. Slide4:  I Introduction to Quartz Crystal Microbalance The relation between the mass changes  m (g) due to absorbed gas molecules and the frequency shifts  f (Hz) follows the Sauerbrey equation  f = -(2f0/Zq)  m Zq = 8.8*106 kg m-2s-1 is the acoustic impedance of the quartz f0 (Hz) = the frequency of the fundamental  m (g)= the areal mass density Slide5:  I Introduction to Quartz Crystal Microbalance Removed Evaporated CuPc,ZnPc CuPc Copper Phthalocyanines ZnPc Zinc Phthalocyanines Commercial Quartz 2 MHz Slide6:  Structure of CuPc and ZnPc Slide7:  Systems 1. Large Chamber Valve 2 Valve 1 Syringe Fan Filter paper II Circuits and Measuring Systems QCM Slide8:  Systems 1. Large Chamber II Circuits and Measuring Systems Slide9:  Systems 1. Large Chamber II Circuits and Measuring Systems Slide10:  Systems 1. Large Chamber II Circuits and Measuring Systems Slide11:  Systems 1. Large Chamber II Circuits and Measuring Systems Slide12:  Reference Frequency Remote Frequency II Circuits and Measuring Systems Systems 1. Large Chamber Slide14:  II Circuits and Measuring Systems Systems 2. Small Chamber Slide15:  Systems 2. Small Chamber Counter 32 bits oscillator circuit II Circuits and Measuring Systems relay fan & solenoid valve Slide16:  Systems 2. Small Chamber II Circuits and Measuring Systems Slide17:  Systems 2. Small Chamber II Circuits and Measuring Systems \:  Measure time = 4 hours II Circuits and Measuring Systems \ Measuring Systems Slide20:  III Results Systems 1. Large Chamber Systems 2. Small Chamber Slide21:  III Results Slide22:  III Results Slide23:  IV Conclusions I. Can invent Homemade Quartz Crystal Microbalance Systems for detect any alcohol odor. II. This systems can classify the different alcohol and different concentration of alcohol. III. System 1:Large chamber have noise lower than System 2:Small chamber. Slide24:  Thank You for Your Attention

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