DGIST Scholar: Gas sensors based on carbon nanoflake/tin oxide composites for ammonia detection

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Gas sensors based on carbon nanoflake/tin oxide composites for ammonia detection

Title: Gas sensors based on carbon nanoflake/tin oxide composites for ammonia detection

Subject: Ammonia ; Ammonia Concentrations ; Ammonia Gas Sensors ; Carbon ; Carbon Nano-Materials ; Carbon Nano Material ; Carbon Nanoflake ; Chemical Sensors ; Composite ; Composite Material ; Composite Materials ; Controlled Study ; Electrochemical Methods ; Electrochemistry ; Field Emission Scanning Electron Microscopy ; Film ; Gas ; Gas Detectors ; Gas Sensor ; Graphite ; Manufacturing ; Microscopy, Electron, Scanning ; Nanoparticle ; Nanoparticles ; Nanotechnology ; Operating Temperature ; Optimal Temperature ; Physical and Chemical Characteristics ; Raman Spectrometry ; Reproducibility of Results ; Resistive Gas Sensors ; Response Time ; Scanning Electron Microscopy ; Sensor ; Spectrum Analysis, Raman ; Surface Properties ; Temperature ; Temperature Effect ; Tin Compounds ; Tin Oxide ; Tin Oxides ; Transmission Electron Microscopy ; Unclassified Drug

Abstract: Carbon nanoflake (CNFL) was obtained from graphite pencil by using the electrochemical method and the CNFL/SnO2 composite material assessed its potential as an ammonia gas sensor. A thin film resistive gas sensor using the composite material was manufactured by the drop casting method, and the sensor was evaluated to test in various ammonia concentrations and operating temperatures. Physical and chemical characteristics of the composite material were assessed using SEM, TEM, SAED, EDS and Raman spectroscopy. The composite material having 10% of SnO2 showed 3 times higher sensor response and better repeatability than the gas sensor using pristine SnO2 nano-particle at the optimal temperature of 350°C. © 2013 Elsevier B.V.