Vapor and Pressure Sensors Based on Cellulose Nanofibers and Carbon Nanotubes Aerogel with Thermoelectric Properties  

作　　者：Rajendran Muthuraj Abhishek Sachan Mickael Castro Jean-Francois Feller Bastien Seantier Yves Grohens 

机构地区：[1]Dupuy de Lôme Research Institute(IRDL),FRE CNRS 3744,University of Southern Brittany,Rue de Saint Maudé,56321 Lorient Cedex,France

出　　处：《Journal of Renewable Materials》2018年第3期277-287,共11页可再生材料杂志（英文）

摘　　要：In this work,thermally insulating and electrically conductive aerogels were prepared from cellulose nanofibers(CNF)and carbon nanotubes(CNTs)by environmentally friendly freeze-drying process.The thermal conductivity of neat CNF aerogel is 24 mW/(m・K)with a density of 0.025 g/cm3.With the addition of CNTs into CNF aerogel,the electrical conductivity was significantly increased while the thermal conductivity was increased to 38 mW/(m・K).Due to these interesting properties,the Seebeck coefficient and the figure of merit(ZT)of the CNF/CNTs aerogels were measured and showed that CNF/CNTs aerogel thermoelectric properties can be improved.The compressibility and electrical resistance of the CNF/CNTs aerogel highlighted its pressure-responsive property.A set of volatile organic compounds(VOCs)were exposed to aerogels to monitor the resistance change.The CNF/CNTs aerogel showed high sensitivity and good response to both nonpolar and polar vapors due to the absorption by both CNF and CNTs networks.The prepared CNF/CNTs aerogel is therefore a good candidate for thermal insulation,thermoelectric material,VOCs sensing,and pressure-sensing applications.

关 键 词：CNF/CNTs aerogel thermal conductivity pressure sensing thermoelectric materials VOCs sensing 

分 类 号：TB3[一般工业技术—材料科学与工程]