Molecularly-tunable nanoelectrode arrays created by harnessing intermolecular interactions

Cheng, Huhu; Wang, Shan; Porter, Marc D.; Zhong, Chuan‐Jian

doi:10.1039/d0sc06955h

Cited by 3 publications

(4 citation statements)

References 55 publications

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“…Alternative formulations include hydrogen-bonding-mediated assembly of Au NPs, which show negative responses to water and methanol but positive responses to ethanol, propanol, and so forth . The Au–thiolate chemistry on the surface of gold enables the self-assembly of thiolate monolayers with different functional groups to tune the sensing interfaces. , …”

Section: Resultsmentioning

confidence: 99%

“…49 The Au−thiolate chemistry on the surface of gold enables the selfassembly of thiolate monolayers with different functional groups to tune the sensing interfaces. 50,51 The fibrous sensors with different fiber diameters also include those derived from PAN fibers with a fiber diameter of 163 ± 33 nm and DD-Au NPs (6 nm), PMMA with a fiber diameter of 552 ± 99 nm and DD-Au NPs (6 nm), and carbon nanotubes (CNTs) with a diameter of 26 nm and 1,9-nonanedithiol (NDT)-capped Au (2 nm). PMMA was fabricated on the support of PET using an electrospinning method (Figure S7).…”

Section: Resultsmentioning

confidence: 99%

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Nano-Filamented Textile Sensor Platform with High Structure Sensitivity

Yan

Dinh

Shang

et al. 2022

ACS Appl. Mater. Interfaces

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A key challenge to the creation of chemically responsive electro-functionality of nonconductive, hydrophobic, and free-contacted textile or fibrous network materials is how to impart the 3D structure with functional filaments to enable responsive structure sensitivity, which is critical in establishing the fibrous platform technology for sensor applications. We demonstrate this capability using an electrospun polymeric fibrous substrate embedded with nano-filaments defined by size-tunable gold nanoparticles and structurally sensitive dendrons as crosslinkers. The resulting interparticle properties strongly depend on the assembly of the nano-filaments, enabling an interface with high structure sensitivity to molecular interactions. This is demonstrated with chemiresistive responses to vaporous alcohol molecules with different chain lengths and isomers, which is critical in breath and sweat sensing involving a high-moisture or -humidity background. The sensitivity scales with the chain length and varies with their isomers. This approach harnesses the multifunctional tunability of the nano-filaments in a sensor array format, showing high structure sensitivity to the alcohol molecules with different chain lengths and isomers. The high structure sensitivity and its implications for a paradigm shift in the design of textile sensor arrays for multiplexing human performance monitoring via breath or sweat sensing and environmental monitoring of air quality are also discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Nano-Filamented Textile Sensor Platform with High Structure Sensitivity

Yan

Dinh

Shang

et al. 2022

ACS Appl. Mater. Interfaces

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“…This capability enables the tuning of sensing interfaces for different applications. [94,95] This array served as a compelling proof-ofconcept, illustrating its remarkable capacity for detecting alcohol molecules with various chain lengths and isomers, exhibiting high structural sensitivity. The sensor array consists of six sensors derived from nano filaments with variations in their substrates (flat and fibrous), nanoparticle sizes (diameter of 2, 6, 13, and 30 nm) and linker molecules of varied chemical structures, which are sensors derived from 2D rigid decanethiol-Au 6nm and dendron-Au 6nm , and 3D fibrous dendron-AuNP (2, 6, 13, and 30 nm).…”

Section: Detection Of Vocs With Nano-filamented Textile Sensor Platformmentioning

confidence: 99%

Flexible, Fibrous, and Rigid Chemiresistive VOC Sensors with Nanoparticle‐Structured Interfaces

Shang,

Dinh,

Cheng

et al. 2023

Advanced Sensor Research

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As one of the noninvasive screening and diagnostic tools for human breath monitoring of various diseases, chemiresistive devices with nanomaterials as the sensing interfaces for detecting volatile organic compounds (VOCs) have attracted increasing interests. A key challenge for the practical applications is an effective integration of all components in a system level. By integrating with the system components, it provides reliable and rapid results as a fast‐screening method for healthcare, safety, and environmental monitoring. This paper highlights some of the latest developments in chemiresistive sensors designed for the detection of VOCs and human breaths. It begins with a brief introduction to the fundamental principles of chemiresistive sensors with nanoparticle‐structured sensing interfaces. This is followed by a discussion of the recent fabrication methods, with an emphasis on nanostructured materials. Some of the recent examples will be highlighted in terms of recent innovative approaches to sensor applications and system integrations. Challenges and opportunities will also be discussed for the advancement and refinement of the chemiresistive sensor technologies in breath screening and monitoring of diseases.

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“…In studies of heterogeneous electron transfer reactions, for example, defects in an adlayer can result in a poorly defined separation between donor and acceptor [3,17]. Defects [18][19][20][21][22][23][24][25][26][27][28][29] can also compromise the performance of adlayers designed for selective detection based on the size and/or shape of an analyte [3,[30][31][32][33][34][35][36][37][38][39][40]. It is therefore fundamentally and technologically important to understand the origins and structural characteristics of the defects existent in these systems [41].…”

Section: Introductionmentioning

confidence: 99%

On the Counter‐intuitive Heterogeneous Electron Transfer Barrier Properties of Alkanethiolate Monolayers on Gold: Smooth versus Rough Surfaces

et al. 2022

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Alkanethiolate monolayers formed on rough gold surfaces can, somewhat surprisingly, act as stronger barriers to heterogeneous electron transfer than those on smooth gold surfaces. This paper presents a possible explanation for this observation by constructing simple geometric models of a "rough" and "smooth" gold surface to examine how microscopic roughness differences can affect the nucleation/growth of the adlayer and size/density of structural defects. Expectedly, the number of defects predicted for adlayers formed on smooth gold is lower than any of those for rough gold. The counterintuitive result is that the sizes of a small portion of the defects in the adlayer on the smooth surface are larger than any of those found on the rough surface. The potential implications of these results are discussed.

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Molecularly-tunable nanoelectrode arrays created by harnessing intermolecular interactions

Abstract: Intermolecular interactions in monolayer assembly are harnessed for creating molecularly-tunable nanoelectrode arrays or ensembles.

Cited by 3 publications

References 55 publications

Nano-Filamented Textile Sensor Platform with High Structure Sensitivity

Nano-Filamented Textile Sensor Platform with High Structure Sensitivity

Flexible, Fibrous, and Rigid Chemiresistive VOC Sensors with Nanoparticle‐Structured Interfaces

On the Counter‐intuitive Heterogeneous Electron Transfer Barrier Properties of Alkanethiolate Monolayers on Gold: Smooth versus Rough Surfaces

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