Suspended graphene sensor with controllable width and electrical tunability via direct-write functional fibers. (October 2020)

• Record Type: Journal Article
• Authors: Regmi, Abiral; Shin, Dongwoon; Kim, Jong-Hyun; Choi, Sun; Chang, Jiyoung
• Is Part Of: Journal of manufacturing processes. Volume 58(2020)
• Page Start: 458
• Page End: 465
• Publication Date: 2020-10
• Subjects: Graphene patterning -- Near-field electrospinning -- Suspended graphene; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2020.08.040
• Languages: English
• ISSNs: 1526-6125

Abstract

Graphical abstract: Highlights: Near-field electrospinning as a one-step method for both patterning and tuning graphene material property. Device sensitivity enhancement by scaling down the dimensions of suspended graphene channel. A novel suspended graphene resistive sensor for dry NH3 gas detection. Abstract: In our study, we report Near-field electrospinning as a novel method of patterning and tuning suspended graphene channel. As a proof of concept, a resistive sensor has been fabricated for the detection of air carrying NH3 gas vapors. The suspended graphene channel, performing as the primary sensing element, changes its resistivity when NH3 molecules are absorbed on the surface of the graphene, effectively functioning as scattering centers. By utilizing the Near-field electrospinning for the deposition of the functional fibers, not only the width of the bridge but also the chemical doping effect on graphene can be readily tuned through the adjustment of process parameters and implementation of a wide range of polymers. About 78 % boost in sensitivity is confirmed when the width of suspended graphene channel is decreased from 15 μm to 5 μm. The presented process is expected to provide a simple, cost-effective and one-step precise manufacturing method by easily creating suspended graphene channels for a wide range of sensing applications not just limited to gas detection.