New carbon black composite vapor detectors based on multifunctional polymers
New carbon black composite vapor detectors based on multifunctional polymers
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DOI：
10.1016/j.snb.2005.07.032
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发表时间：
2005-11-11
影响因子：
8.4
通讯作者：
Ferrari, V
中科院分区：
文献类型：
--
作者：
Sartore, L;Penco, M;Ferrari, V
这项工作的目的是开发具有金属离子络合能力的导电炭黑和绝缘有机多功能聚合物复合材料形成的蒸汽检测器。新材料是为提高对特定类别的分析气体的灵敏度而量身定做的。以聚氯乙烯(PVC)和邻苯二甲酸二(2-乙基己基)酯(DOP)作为传统低分子质量增塑剂，作为传统复合蒸气检测器的代表。在聚合物-炭黑复合材料上同时进行了石英晶体微天平(QCM)的共振频移和直流电阻的测量。所提出的材料在暴露于醋酸和胺的蒸气中表现出增强的灵敏度；我们的系统的性能是传统复合蒸气检测器的103倍。此外，这种反应的程度超出了暴露在相同蒸气中的质量吸收所期望的程度，不能仅仅归因于聚合物/气体分配系数的差异。在这方面，几种不同的化学因素决定了该体系的直流电响应：在我们看来，吸附过程中聚合物构象的变化也起着重要作用。(C)2005 Elsevier B.V.保留所有权利。
The aim of this work is the development of vapor detectors formed from composites of conductive carbon black and insulating organic multifunctional polymers having metal ions complexing ability. The new materials are tailored to produce increased sensitivity toward specific classes of analyte vapors. For comparison purpose, poly(vinyl chloride) (PVC) with di(2-ethylhexyl)phthalate (DOP), a traditional low molecular weight plasticizer, is used as representative of the behavior of a traditional composite vapor detector.Resonant frequency shift of a quartz crystal microbalance (QCM) and dc resistance measurements have been performed simultaneously on polymer-carbon black composite materials.The proposed materials showed an enhanced sensitivity upon exposure to acetic acid and amines vapors; the performances of our systems are 103 times higher than those of a traditional composite vapor detector. Moreover the extent of such responses is beyond that expected by mass uptake upon exposure to the same vapors and cannot be attributed solely to differences in polymer/gas partition coefficients. In this respect, several different chemical factors determine the dc electrical response of this system: in our opinion changes in polymer conformation during the adsorption process also play a significant role. (c) 2005 Elsevier B.V. All rights reserved.