TY - JOUR
T1 - Interface-Sensitized Chemiresistor
T2 - Integrated Conductive and Porous Metal-Organic Frameworks
AU - Cho, Sujee
AU - Park, Chungseong
AU - Jeon, Mingyu
AU - Hwa Lee, Jae
AU - Kwon, Ohmin
AU - Seong, Seoyeon
AU - Kim, Jihan
AU - Kim, Il Doo
AU - Ri Moon, Hoi
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/12/1
Y1 - 2022/12/1
N2 - Research to develop ideal sensing devices for toxic gases is on the rise, and amongst various materials, metal–organic frameworks (MOFs) have opened up promising vistas as chemiresistive sensors due to their high structural and functional tunability. Here, we report the composites of dimensionally (2D and 3D) and functionally (conductive and porous) different two MOFs in the form of a well-integrated core–shell structure. The hierarchically assembled 2D-MOF@3D-MOF exhibits new interfacial properties that are responsible for synergetically enhanced sensing performances toward toxic H2S gas with the lowest recorded limit of detection (1.4 ppb), superior sensitivity (ΔR/R0 = 3.37), and outstanding selectivity at room temperature in air. The sensing mechanisms are proposed by combinational studies of experiments and calculation, which indicates that multiple changes (e.g., local structural change of the shell MOF, secondary binding sites generation from the core MOF, and free radicals formation) play a critical role in achieving synergetic chemiresistive sensing.
AB - Research to develop ideal sensing devices for toxic gases is on the rise, and amongst various materials, metal–organic frameworks (MOFs) have opened up promising vistas as chemiresistive sensors due to their high structural and functional tunability. Here, we report the composites of dimensionally (2D and 3D) and functionally (conductive and porous) different two MOFs in the form of a well-integrated core–shell structure. The hierarchically assembled 2D-MOF@3D-MOF exhibits new interfacial properties that are responsible for synergetically enhanced sensing performances toward toxic H2S gas with the lowest recorded limit of detection (1.4 ppb), superior sensitivity (ΔR/R0 = 3.37), and outstanding selectivity at room temperature in air. The sensing mechanisms are proposed by combinational studies of experiments and calculation, which indicates that multiple changes (e.g., local structural change of the shell MOF, secondary binding sites generation from the core MOF, and free radicals formation) play a critical role in achieving synergetic chemiresistive sensing.
KW - Chemiresistive sensing
KW - Conductive MOF
KW - HS detection
KW - Interface
KW - MOF@MOF heterostructure
UR - http://www.scopus.com/inward/record.url?scp=85142718424&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.137780
DO - 10.1016/j.cej.2022.137780
M3 - Article
AN - SCOPUS:85142718424
SN - 1385-8947
VL - 449
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 137780
ER -