One pot synthesis of free standing highly conductive polymer nanocomposite films: Towards rapid BTX vapor sensor

Abstract

In this work, we report the synthesis of robust, flexible, and free standing PMMA/NGP (nanographitic platlets) composite by one‐pot polymerization technique for sensing organic vapors. The synergy between the NGPs and PMMA matrix through strong interaction results in remarkable electrical and sensing properties of the composite system. The chemical structure and morphology of as‐prepared PMMA/NGP composites were investigated by using FTIR, XRD, and SEM techniques. The electrical conductivity of the prepared PMMA/NGP composites increases with increasing concentration of NGPs owing to the formation of conductive paths within the composite due to the quantum tunneling mechanism. The electrical conductivity of PMMA/NGP composites with different NGP concentration shows a percolation behavior with percolation threshold of ∼1.2 wt%. The temperature dependent conductivity studies of the PMMA/NGPs were studied to understand the charge transport mechanism in the composite films by using Mott's Variable range hopping model. The PMMA/NGP composite have been evaluated for detection of benzene, toluene, and xylene vapors and were found to exhibit fast response, rapid recovery, and excellent repeatability. The sensitivity along with the flexibility of PMMA/NGP composite films opens up a new opportunity to fabricate the sensor in any shape as per the requirement of modern electronics. POLYM. ENG. SCI., 58:1074–1081, 2018. © 2017 Society of Plastics Engineers

Aromatik hidrokarbonların dedekte edilmesi için kaliksaren bazlı diamid kimyasal sensor çiplerinin geliştirilmesi

“…Sunulan çalışmada, yeni kaliks [4]aren bazlı diamid makrosiklik malzemesi (SB77) sensör malzemesi olarak seçildi ve bu makrosiklik bileşiklerin Langmuir-Blodgett (LB) ince filmlerinin, aromatik hidrokarbon (benzen, toluen, ksilen)buharlarına karşı buhar algılama kapasiteleri Kuartz Kristal Mikrobalans (KKM) tekniği ile araştırılmıştır.…”

“…QCM measurement technique was preferred to examine both the preparation of the SB77 LB film layers and search the chemical vapor sensing properties of the SB77 calix [4]arene based diamide sensor chip with subjected to the pollutant aromatic hydrocarbon vapors. An oscillating circuit (a home-made designed) and quartz crystals (oscillation frequency of 3.5 MHz) were employed for the controlling of SB77 LB thin films' homogeneity and all kinetic measurements.…”

“…Figure 5. The mass shift of SB77 calix [4]arene based diamide LB film on the quartz crystal.…”

“…The values of the vapor pressures are ordered as benzene (9.95 kPa) > toluene (2.91 kPa) > m-xylene (0.80 kPa). As a result, benzene molecules, due to its low molar volume and high vapor pressure, can easily infiltrate into SB77 calix [4]arene based diamide nano films when compared with the guest molecules of other aromatic hydrocarbon vapors.…”

“…The calix [4]arene based diamide chemical sensor was prepared by using LB thin film technique. QCM technique was preferred to investigate the characterization of SB77 calix [4]arene LB thin film and its sensing properties against to pollutant BTX aromatic hydrocarbon vapors. All experimental results demonstrated that the SB77 monolayers were uniformly picked up at the air-water interface and these very uniform arrangements were transferred onto the quartz crystal to be formed as LB layers.…”