奈米碳管表面修飾結構與氣體感測選擇性之研究
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2013
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本研究使用化學合成方式在單層奈米碳管(Single Wall Carbon Nanotube)表面修飾羧酸基和酯類官能基，以及表面包覆十二烷基硫酸鈉共三種改質材料，改變奈米碳管的表面化學選擇性。單層奈米碳管表面修飾材料塗佈於電阻式感測器和質量式感測器上作為氣體感測器，並量測和記錄有機氣體感測時電阻的變化和奈米碳管管壁上吸附有機氣體分子之質量變化，進一步探討奈米碳管表面修飾不同官能基其對於不同有機揮發性氣體的靈敏度以及選擇性的變化。研究成果顯示，由於和有機揮發性氣體形成氫鍵以及極性官能基結構使得單層奈米碳管上表面修飾羧酸基以及酯類官能基對於極性有機揮發性氣體有較好的靈敏度。然而對於表面包覆十二烷基硫酸鈉改質材料，則是偵測甲苯氣體反應性較好。本研究合成出三種官能基改質材料於單層奈米碳管表面上，應用於有機揮發性氣體電阻式感測器偵測，未來將這些奈米碳管表面修飾材料應用於微小化GC氣體感測器。
In this study, we modified the surface of the single-wall carbon nanotube (SWCNT) with a series of functional groups such as carboxylic group and ester group by chemical synthesis and doping of sodium dodecyl sulfate (SDS). We used three modified materials to change the surface chemical selectivity. Surface modified CNTs were coated on chemiresistor (CR) and quartz crystal microbalance (QCM) as gas sensors. We used them to measure the correlation of the electrical resistance and the mass changes during vapor sorption and to investigate the sensitivity and selectivity versus different volatile organic compounds (VOCs) after surface functionalized. As a result of the hydrogen bond with VOCs and polar functional groups show that SWCNT-COOH and SWCNT-ESTER have better sensitivity to polar VOCs. However, SWCNT-SDS has better reaction for detecting toluene. In this study, we synthesized three functional groups modified material on the surface of SWCNT, used for detecting volatile organic compounds. In the future, we will apply the surface modified SWCNTs as the sensing materials for miniaturized GC detector.
In this study, we modified the surface of the single-wall carbon nanotube (SWCNT) with a series of functional groups such as carboxylic group and ester group by chemical synthesis and doping of sodium dodecyl sulfate (SDS). We used three modified materials to change the surface chemical selectivity. Surface modified CNTs were coated on chemiresistor (CR) and quartz crystal microbalance (QCM) as gas sensors. We used them to measure the correlation of the electrical resistance and the mass changes during vapor sorption and to investigate the sensitivity and selectivity versus different volatile organic compounds (VOCs) after surface functionalized. As a result of the hydrogen bond with VOCs and polar functional groups show that SWCNT-COOH and SWCNT-ESTER have better sensitivity to polar VOCs. However, SWCNT-SDS has better reaction for detecting toluene. In this study, we synthesized three functional groups modified material on the surface of SWCNT, used for detecting volatile organic compounds. In the future, we will apply the surface modified SWCNTs as the sensing materials for miniaturized GC detector.
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單層奈米碳管, 電阻式感測器, 質量式感測器, single wall carbon nanotube, chemiresistor, quartz crystal microbalance