Abstract
A nanocomposite of cross-linked bacterial cellulose–amino graphene/polyaniline (CLBC-AmG/PANI) was synthesized by covalent interaction of amino-functionalized graphene (AmG) AmG and bacterial cellulose (BC) via one step esterification, and then the aniline monomer was grown on the surface of CLBC-AmG through in situ chemical polymerization. The morphological structure and properties of the samples were characterized by using scanning electron microscopy (SEM), and thermal gravimetric analyzer (TGA). The CLBC-AmG/PANI showed good electrical-resistance response toward carbon dioxide (CO2) at room temperature, compared to the BC/PANI nanopaper composites. The CLBC-AmG/PANI sensor possesses high sensitivity and fast response characteristics over CO2 concentrations ranging from 50 to 2000 ppm. This process presents an extremely suitable candidate for developing novel nanomaterials sensors owing to easy fabrication and efficient sensing performance.
Highlights
It is commonly regarded that high sensitivity, fast response and recovery times, as well as excellent selectivity and functionality at room temperature are important parameters for the evaluation of gas sensors [1,2]
When the response reaches a whiskers like carbon, whereas the D band refers to the disorder in chemically-functionalized constant value, the sensor was exposed to N2 to remove CO2 and the recovery behavior of the sensor graphene sheets
The structure of amino-functionalized graphene (AmG) and CLBC-AmG were studied by using Raman spectra, both the AmG and temperatures of about 449 °C, as the result of the decomposition of amino-carbons, corresponding to CLBC-AmG nanopaper have two characteristic peaks at 1595 and 1349 cm−1 corresponding to the G and previously reported results for the functionalization of graphene with amino groups [28]
Summary
It is commonly regarded that high sensitivity, fast response and recovery times, as well as excellent selectivity and functionality at room temperature are important parameters for the evaluation of gas sensors [1,2]. In the last few decades, research into functional materials with special nanoscale architecture has attracted great interest and has presented enhanced properties in numerous applications. Polyaniline is commonly used in gas sensor materials due to its unique electrical conductivity, redox properties, low production cost, easy preparation in solution, and good stability at room temperature [13,14]. These properties are crucial in gas sensors as they lower the detection limit, decrease the response time, and improve sensitivity. In in situ chemical oxidative polymerization, the aniline monomer is oxidized by utilizing ammonium persulfate as the Sensors 2019, 19, 5215; doi:10.3390/s19235215 www.mdpi.com/journal/sensors
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