Gas sensors based on carbon nanoflake/tin oxide composites for ammonia detection.
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.
Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea.
Soo-Keun
SK
Lee
Nano & Bio Research Division, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 711-873, Republic of Korea.
Daeic
D
Chang
Department of Advanced Materials Chemistry, College of Science and Technology, Dongguk University-Gyeongju, Gyeongju, Gyeongbuk 780-714, Republic of Korea. Electronic address: swkim@dongguk.ac.kr.
Sang Wook
SW
Kim
D000641:Ammonia / Q000032:analysis*; D002244:Carbon / Q000737:chemistry*; D004563:Electrochemistry; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D015203:Reproducibility of Results; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D017971:Tin Compounds / Q000737:chemistry*
D017971:Tin Compounds; D002244:Carbon; D000641:Ammonia; C045358:stannic oxide
Ammonia; Carbon nano material; Composite material; Gas sensor; Tin oxide