Layer-by-layer assembled dual-ligand conductive MOF nano-films with modulated chemiresistive sensitivity and selectivity

Wu, Anqi; Wang, Wenqing; Zhan, Hongbin; Cao, Lin‐An; Ye, Xiao-Liang; Zheng, Jiajia; Pendyala, Naresh Kumar; Chiranjeevulu, Kashi; Wen, Ding; Wang, Guan‐E; Yao, Ming‐Shui; Xu, Gang

doi:10.1007/s12274-020-2823-8

Cited by 79 publications

(37 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… 26 In conductive MOFs, analyte gases are known to interact with the metal node or functional groups of ligands and change the resistance by the exchange of charges. 18 − 21 From this perspective, the higher response of the smaller Cu 3 (HHTP) 2 can be attributed to more interaction between the gas and the reaction sites of MOFs with high surface areas.…”

Section: Resultsmentioning

confidence: 99%

Visible-Light-Activated Type II Heterojunction in Cu₃(hexahydroxytriphenylene)₂/Fe₂O₃ Hybrids for Reversible NO₂ Sensing: Critical Role of π–π* Transition

Lim

Yoon

et al. 2021

ACS Cent. Sci.

View full text Add to dashboard Cite

Metal–organic frameworks (MOFs) with high surface area, tunable porosity, and diverse structures are promising platforms for chemiresistors; however, they often exhibit low sensitivity, poor selectivity, and irreversibility in gas sensing, hindering their practical applications. Herein, we report that hybrids of Cu 3 (HHTP) 2 (HHTP = 2,3,6,7,10,11-hexahydroxytriphenylene) nanoflakes and Fe 2 O 3 nanoparticles exhibit highly sensitive, selective, and reversible detection of NO 2 at 20 °C. The key parameters to determine their response, selectivity, and recovery are discussed in terms of the size of the Cu 3 (HHTP) 2 nanoflakes, the interaction between the MOFs and NO 2 , and an increase in the concentration and lifetime of holes facilitated by visible-light photoactivation and charge-separating energy band alignment of the hybrids. These photoactivated MOF–oxide hybrids suggest a new strategy for designing high-performance MOF-based gas sensors.

show abstract

Section: Resultsmentioning

confidence: 99%

Visible-Light-Activated Type II Heterojunction in Cu₃(hexahydroxytriphenylene)₂/Fe₂O₃ Hybrids for Reversible NO₂ Sensing: Critical Role of π–π* Transition

Lim

Yoon

et al. 2021

ACS Cent. Sci.

View full text Add to dashboard Cite

show abstract

“…ThePXRD spectra and FTIR spectra of the MOF thin film demonstrated that there were strong interactions between NH 3 and the MOF framework which did not influence the original crystal structure.T hey inferred that host-guest interactions might result in the high selectivity to NH 3 .U ltraviolet photoelectron spectroscopy also showed that the Fermi level of Cu 3 (HHTP) 2 (10 cycles) increased by 1.13 eV after adsorption of NH 3 .W hen the analytes provide the doped electron to recombine with the hole (charge carrier), the carrier concentration will decrease in the MOF, resulting in the increased resistance of sensor (Figure 7f). Later Wu et al [74] adopted ad ual-ligand design strategy to modulate the performance of the electronically conductive MOF thin film;t hey used as pray layer-by-layer assembly method. TheHITP-doped Cu-HHTP exhibited high sensitivity and selectivity to NH 3 and benzene.From astructural view, Meng et al [75] described amodular strategy for the integration of metallophthalocyanine-based building blocks into 2D MOFs where 2D meshes exhibited ac ombination of multifunctionality:e xcellent conductivity,h igh surface area, low dimensionality,a nd ordered arrangement of active sites on the nanoscale (Figure 8a).…”

Section: Electronic Function Layermentioning

confidence: 99%

The Role of Metal–Organic Frameworks in Electronic Sensors

2021

View full text Add to dashboard Cite

H ereceived his Ph.D. in organic chemistry from Fujian Institute of Research on the Structure of Matter under the direction of Prof. Tian-Lu Sheng. His research interests include MOF materials in functional electronic devices. Ye Zhou is an IAS Fellow and group leader in the Institute for Advanced Study,Shenzhen University.H is research interests include flexible and printed electronics, organic/inorganic semiconductors, surface and interface physics, nanostructured materials, and nanoscale devices for technological applications, such as logic circuits, data storage, energy harvesting, photonics, and sensors.

show abstract

“…used LPE to prepare a nano‐scale, dual‐ligand conductive MOF film with a smooth surface on a OH functionalized substrate. [ 124 ] After 10 cycles of alternate exposure in a mixed solution of metal ions and two organic ligands, HITP‐doped Cu‐HHTP‐10C nanofilms with different doping ratios were prepared. The results show that the selectivity of HITP‐doped Cu‐HHTP‐10C nanofilms for benzene over NH 3 (S = R benzene /R NH3 ) gradually increases with increasing HITP ligand doping in the Cu‐HHTP framework.…”

Section: Applicationsmentioning

confidence: 99%

Recent Progress on Conductive Metal‐Organic Framework Films

Wang

Sun

et al. 2021

Adv Materials Inter

View full text Add to dashboard Cite

Because of their outstanding structural, chemical, and functional diversity, metal‐organic frameworks (MOFs) have brought about worldwide interest over the last 2 decades, which have been utilized in a wide range of applications in the fields of gas separation, storage, catalysis, and drug delivery. However, among these applications, MOFs are almost used in the form of powder. Due to their fragility and difficulty in preparing large‐area thin film materials, the study of MOF films and their electronic properties is a challenging problem in the research of MOFs. Owing to the low‐energy charge transport mode, most MOF films are essentially insulating, which largely limits their applications in fields where electronic charge transport takes place, such as electronics or electrochemistry. So, the introduction of conductivity into the MOF films opens new avenues for their applications in electrochemical sensing, supercapacitors, batteries, electrocatalysis, and electronic devices and makes the research on and with MOF films very active. Herein, the latest progress of conductive MOF films, including the preparation of MOF films, the design and adjustment strategies for constructing intrinsic and doping conductive MOF films, and their applications are reviewed. In addition, the numerous challenges of conductive MOF films are also elaborated.

show abstract

Layer-by-layer assembled dual-ligand conductive MOF nano-films with modulated chemiresistive sensitivity and selectivity

Cited by 79 publications

References 45 publications

Visible-Light-Activated Type II Heterojunction in Cu₃(hexahydroxytriphenylene)₂/Fe₂O₃ Hybrids for Reversible NO₂ Sensing: Critical Role of π–π* Transition

Visible-Light-Activated Type II Heterojunction in Cu₃(hexahydroxytriphenylene)₂/Fe₂O₃ Hybrids for Reversible NO₂ Sensing: Critical Role of π–π* Transition

The Role of Metal–Organic Frameworks in Electronic Sensors

Recent Progress on Conductive Metal‐Organic Framework Films

Contact Info

Product

Resources

About

Layer-by-layer assembled dual-ligand conductive MOF nano-films with modulated chemiresistive sensitivity and selectivity

Cited by 79 publications

References 45 publications

Visible-Light-Activated Type II Heterojunction in Cu3(hexahydroxytriphenylene)2/Fe2O3 Hybrids for Reversible NO2 Sensing: Critical Role of π–π* Transition

Visible-Light-Activated Type II Heterojunction in Cu3(hexahydroxytriphenylene)2/Fe2O3 Hybrids for Reversible NO2 Sensing: Critical Role of π–π* Transition

The Role of Metal–Organic Frameworks in Electronic Sensors

Recent Progress on Conductive Metal‐Organic Framework Films

Contact Info

Product

Resources

About

Visible-Light-Activated Type II Heterojunction in Cu₃(hexahydroxytriphenylene)₂/Fe₂O₃ Hybrids for Reversible NO₂ Sensing: Critical Role of π–π* Transition

Visible-Light-Activated Type II Heterojunction in Cu₃(hexahydroxytriphenylene)₂/Fe₂O₃ Hybrids for Reversible NO₂ Sensing: Critical Role of π–π* Transition