Welding of Gold Nanoparticles on Graphitic Templates for Chemical Sensing

Ding, Mengning; Sorescu, Dan C.; Kotchey, Gregg P.; Star, Alexander

doi:10.1021/ja210278u

Cited by 75 publications

(97 citation statements)

References 45 publications

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“…We (19,(28)(29)(30) and others (31)(32)(33)(34)(35) have demonstrated several approaches for selective sensing of various gases and VOCs at part-per-million and partper-billion concentrations using chemiresistive devices based on randomly oriented networks of CNTs. Most of these approaches involve covalent or noncovalent solution-phase chemical functionalization of CNTs to generate selective-sensing materials.…”

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confidence: 99%

Rapid prototyping of carbon-based chemiresistive gas sensors on paper

Mirica

Azzarelli

Weis

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

144

116

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Chemically functionalized carbon nanotubes (CNTs) are promising materials for sensing of gases and volatile organic compounds. However, the poor solubility of carbon nanotubes hinders their chemical functionalization and the subsequent integration of these materials into devices. This manuscript describes a solventfree procedure for rapid prototyping of selective chemiresistors from CNTs and graphite on the surface of paper. This procedure enables fabrication of functional gas sensors from commercially available starting materials in less than 15 min. The first step of this procedure involves the generation of solid composites of CNTs or graphite with small molecule selectors-designed to interact with specific classes of gaseous analytes-by solvent-free mechanical mixing in a ball mill and subsequent compression. The second step involves deposition of chemiresistive sensors by mechanical abrasion of these solid composites onto the surface of paper. Parallel fabrication of multiple chemiresistors from diverse composites rapidly generates cross-reactive arrays capable of sensing and differentiating gases and volatile organic compounds at partper-million and part-per-thousand concentrations. mechanochemistry | gas sensor arrays | pencil | nanocarbon | electronic nose D evelopment of simple and low-cost technologies for detecting and identifying gases and volatile organic compounds (VOCs) is critically important for improving human health, safety, and quality of life (1-3). Carbon nanotubes (CNTs) are promising materials for sensing gases and VOCs because they can be integrated into portable, sensitive, cost-effective, and lowpower devices (4-6). The molecular structure of CNTs renders the electrical conductance of these materials extremely sensitive to changes in their local chemical environment (7), and the compatibility of these materials with covalent (8-11) and noncovalent (11, 12) chemical modification enables fabrication of selective sensors (4).Multiple research groups have exploited several electronic architectures for CNT-based gas and vapor sensors (e.g., chemiresistors, field-effect transistors) with the goal of optimizing various characteristics, such as sensitivity, selectivity, response time and recovery, reproducibility in performance, power requirements, ease of fabrication, and cost (4, 6, 13-15). As a result, various methods have been developed for integrating CNTs into these electronic architectures [e.g., chemical vapor deposition (7, 16), drop casting (17), spin coating (18, 19), spray coating (20, 21), inkjet printing (22, 23), transfer printing (24, 25), and mechanical abrasion (26)]. These methods provide a number of options for integrating CNTs into devices either as individual CNTs, highly aligned arrays of CNTs, or randomly oriented networks of CNTs (4,6,13,15).Chemiresistors based on randomly oriented networks of CNTs offer significant advantages over other types of architectures for CNT-based sensors in terms of simplicity of design, ease of fabrication, compatibility with chemical func...

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mentioning

confidence: 99%

Rapid prototyping of carbon-based chemiresistive gas sensors on paper

Mirica

Azzarelli

Weis

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

144

116

View full text Add to dashboard Cite

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“…[1][2][3][4][5][6][7] As is well known, noble 3 metals are rare and cost-ineffective, which has limited their industrial applications in the past century. Extensive research has been carried out to improve their catalytic efficiency and develop alternative materials.…”

Section: Introductionmentioning

confidence: 99%

“…[35][36][37][38][39] However, it has been a great challenge to utilize light energy directly to initiate or promote catalytic reactions using nanostructured pure noble metals, similar to the role of semiconductors in conventional photocatalysis. 4 Nanostructured noble metals with specific size, shape and assembly have attracted high attention for their structure-modulated surface plasmon resonance (SPR) properties and important applications. For example, Au-based nanocages exhibit higher catalytic activity than their nanobox and nanoparticle counterparts in the catalytic reduction of p-NP.…”

Section: Introductionmentioning

confidence: 99%

Light-Concentrating Plasmonic Au Superstructures with Significantly Visible-Light-Enhanced Catalytic Performance

Yang

Liu

et al. 2015

ACS Appl. Mater. Interfaces

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Noble metals are well-known for their surface plasmon resonance effect that enables strong light absorption typically in the visible regions for gold and silver. However, unlike semiconductors, noble metals are commonly considered incapable of catalyzing reactions via photogenerated electron-hole pairs due to their continuous energy band structures. So far, photonically activated catalytic system based on pure noble metal nanostructures has seldom been reported. Here, we report the development of three different novel plasmonic Au superstructures comprised of Au nanoparticles, multiple-twinned nanoparticles and nanoworms assembling on the surfaces of SiO2 nanospheres respectively via a well-designed synthetic strategy. It is found that these novel Au superstructures show enhanced broadband visible-light absorption due to the plasmon resonance coupling within the superstructures, and thus can effectively focus the energy of photon fluxes to generate much more excited hot electrons and holes for promoting catalytic reactions. Accordingly, these Au superstructures exhibit significantly visible-light-enhanced catalytic efficiency (up to ∼264% enhancement) for the commercial reaction of p-nitrophenol reduction.

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“…Moreover, gold nanostructures, assembled with various methods, have been intensively investigated not only as sensitizers for other materials but also as independent building blocks to fabricate gas sensors [26], especially to detect H 2 S [27,28], depending on the good chemical affinity between S and Au atoms [29,30], and to monitor NO x [31]. Therefore, the modification of CNT-based gas sensors using gold nanoparticles to improve their sensing performance has become a quite popular research topic.…”

mentioning

confidence: 99%