A novel desorption technique for improved sensitivity in sampling for gases

一种新颖的解吸技术，可提高气体采样的灵敏度

• 批准号: 8734929
• 负责人: CLAUDIU T LUNGU
• 金额: $ 18.38万
• 依托单位: UNIVERSITY OF ALABAMA AT BIRMINGHAM
• 依托单位国家: 美国
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8734929
• 关键词: novel; desorption; technique; improved; sensitivity

DESCRIPTION (provided by applicant): Granular Activated Carbon (GAC) is the gold standard for volatile organic compound (VOC) sampling, but recently other carbonaceous porous materials like Single Walled Carbon Nanotubes (SWNT) and Porous Graphitized Carbon Particles (HDCP) have shown comparable adsorption and desorption attributes. Recent studies showed that SWNT efficiently absorb visible light and transform it in heat, hinting that irradiatio of samples loaded with vapors through air sampling could be desorbed by light irradiation. This will significantly simplify the current analytical methods and will increase sensitivity of analysi. We propose to fabricate five different matrix substrates based on SWNT, HDCP and GAC, characterize their physical and adsorption properties and determine the temperature response when irradiated with various energies and frequencies of pulsed, intense visible light. We will use the irradiation scenario that yields the highest temperature increase, load the substrates with toluene vapors and determine the amount of desorbed toluene for each irradiation/substrate/loading combination. If successful this project could open the door for extensive research that will investigate the best parameters needed to build new air samplers based on this new photo-desorption principle.

描述（由申请人提供）：颗粒活性炭（GAC）是挥发性有机化合物（VOC）采样的黄金标准，但最近其他碳质多孔材料，如单壁碳纳米管（SWNT）和多孔石墨化碳颗粒（HDCP）已经表明具有可比性的吸附和解吸特性。最近的研究表明，SWNT 有效吸收可见光并将其转化为热量，这表明通过空气采样加载蒸汽的样品可以通过光照射解吸。这将显着简化当前的分析方法并提高分析的灵敏度。我们建议基于 SWNT、HDCP 和 GAC 制造五种不同的基质基材，表征它们的物理和吸附特性，并确定在不同能量和频率的脉冲强可见光照射下的温度响应。我们将使用产生最高温度升高的辐照方案，用甲苯蒸气负载基材，并确定每种辐照/基材/负载组合的解吸甲苯量。如果成功，该项目将为广泛的研究打开大门，这些研究将调查基于这种新的光解吸原理构建新型空气采样器所需的最佳参数。