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Nanomechanical Gas Sensing with Laser Treated 2D Nanomaterials
Author(s) -
Mistry Kissan,
Ibrahim Khaled H.,
Novodchuk Inna,
Ngo Hyunh Thien,
Imamura Gaku,
Sanderson Joseph,
Yavuz Mustafa,
Yoshikawa Genki,
Musselman Kevin P.
Publication year - 2020
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.202000704
Subject(s) - graphene , materials science , nanomaterials , oxide , molybdenum disulfide , nanotechnology , dopant , boron nitride , adsorption , tungsten disulfide , surface modification , doping , chemical engineering , optoelectronics , chemistry , organic chemistry , composite material , engineering , metallurgy
2D nanomaterials such as graphene oxide (GO), molybdenum disulfide (MoS 2 ), and tungsten disulfide (WS 2 ) are viable candidates for use in chemical gas sensors due to their large specific surface area available for analyte adsorption. In this work, these 2D materials are treated with a femtosecond laser process to intentionally introduce defects, dopants, and functional groups to the material for improved gas adsorption properties. The materials are coated onto a nanomechanical membrane‐type surface stress sensor (MSS) to evaluate their sensing capability toward a select group of volatile organic compounds. By utilizing the MSS platform, the approach avoids the need for 2D materials with conductive properties typically required in chemoresistive sensors. The results show that a longer laser treatment time for graphene oxide increases the sensor response, which is attributed to an increase in defects and oxygen functional groups. Doping of graphene oxide with boron nitride improves sensor response, likely due to the introduction of pyrrolic nitrogen groups with high chemical activity. Additionally, the graphene oxides demonstrate partial selectivity toward the detection of toluene, attributable to π–π interactions. MoS 2 and WS 2 nanoflakes also show enhanced sensor response attributed to the formation of apical/bridging sulfur bonds with high catalytic activity.