10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
The Study of the Role of Morphology and Functional Groups of Crumpled Graphene-based Materials to Determine their Specificity Towards Volatile Organic Compounds in Room-temperature Gas Sensing
KELSEY HADDAD, Siyuan An, Ahmed A. Abokifa, Barani Raman, Fortner John, Pratim Biswas, Washington University in St. Louis
Abstract Number: 391 Working Group: Materials Synthesis
Abstract Chemiresistive gas sensors, introduced in 1962, detect gases through changes in the electrical resistance of a semiconducting material as a function of the surrounding atmosphere. These gas sensors are already prevalent in areas such as environmental monitoring, domestic safety, and industrial processing for monitoring of toxic gases, including nitrogen dioxide, carbon monoxide, ammonia, and nitric oxide, among others. Graphene-based materials show room temperature gas sensing properties, and the functionalization of graphene is an easy approach to modulating sensitivity; nevertheless, their response suffers from long recovery times. A thorough understanding of the interaction between the sensing material and the analyte of interest is an important step in the practical application of these highly tunable materials for selective gas sensing. Crumpled graphene oxide (CGO), with a minimal tendency towards aggregation while still maintaining the high specific surface area and exceptional electronic properties of flat sheets, offers a potential solution for the integration of reduced graphene oxide into scalable and reproducible chemiresistive sensors.1-3 Crumpled graphene, in contrast to 2D flat analogs, has not been studied for gas sensing applications. Moreover, the crumpled ridges of the CGO sheets can be considered as line defects, which should enhance adsorption. To date, the majority of studies for graphene and graphene oxide have focused on environmental gases, with no study systematically looking at the role of functional groups or nanostructured materials on sensing volatile organic compounds (VOCs). The diverse responses seen across different classes of VOCs (apolar, monopolar, and bipolar) will be explored to give insight into the interaction mechanisms of graphene oxide and CGO. The role of morphology and functionalization on the sensing response and mechanism of carbon-based materials was systematically explored by crumpling and reducing graphene oxide sheets. Ultimately, the insights gained by correlating the sensor response to analyte and material properties can aid in the construction of an array focused on sensing specific VOC profiles.
(1) Wang, WN.; Jiang, Y.; Biswas, P. Evaporation-induced crumpling of graphene oxide nanosheets in aerosolized droplets: confinement force relationship. The Journal of Physical Chemistry Letters 2012, 3 (21), 3228-3233. (2) Cranford, S. W.; Buehler, M. J., Packing efficiency and accessible surface area of crumpled graphene. Physical Review B 2011, 84 (20), 205451. (3) Luo, J.; Jang, H. D.; Sun, T.; Xiao, L.; He, Z.; Katsoulidis, A. P.; Kanatzidis, M. G.; Gibson, J. M.; Huang, J., Compression and Aggregation-Resistant Particles of Crumpled Soft Sheets. ACS Nano 2011, 5 (11), 8943-8949.