Light welding Au nanoparticles assembled at water-air interface for monolayered nanoporous gold films with tunable electrocatalytic activity

Han, Mei; Chen, Fei; Li, Moxia; Yu, Renpeng; Xu, Yaomengli; Jiang, Yu-Xiong; Liu, Cai; Hu, Jiawen

doi:10.1016/j.electacta.2020.135626

Cited by 10 publications

(8 citation statements)

References 63 publications

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“…As a result, a pAu-modified electrode significantly increases the number of adsorption sites for enzymes and other biomolecules, thus improving electron transport in comparison with corresponding electrodes with nonporous surfaces. Thus, due to its intriguing properties, pAu is a very promising material for application in (bio)sensing, energy storage, diagnostic medicine, and drug delivery [ 14 , 19 , 21 , 22 , 23 , 24 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Highly Porous 3D Gold Enhances Sensitivity of Amperometric Biosensors Based on Oxidases and CuCe Nanoparticles

et al. 2022

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Metallic nanoparticles potentially have wide practical applications in various fields of science and industry. In biosensorics, they usually act as catalysts or nanozymes (NZs) and as mediators of electron transfer. We describe here the development of amperometric biosensors (ABSs) based on purified oxidases, synthesized nanoparticles of CuCe (nCuCe), and micro/nanoporous gold (pAu), which were electro-deposited on a graphite electrode (GE). As an effective peroxidase (PO)-like NZ, nCuCe was used here as a hydrogen-peroxide-sensing platform in ABSs that were based on glucose oxidase, alcohol oxidase, methylamine oxidase, and L-arginine oxidase. At the same time, nCuCe is an electroactive mediator and has been used in laccase-based ABSs. As a result, the ABSs we constructed and characterized were based on glucose, methanol, methyl amine, L-arginine, and catechol, respectively. The developed nCuCe-based ABSs exhibited improved analytical characteristics in comparison with the corresponding PO-based ABSs. Additionally, the presence of pAu, with its extremely advanced chemo-sensing surface layer, was shown to significantly increase the sensitivities of all constructed ABSs. As an example, the bioelectrodes containing laccase/GE, laccase/nCuCe/GE, and laccase/nCuCe/pAu/GE exhibited sensitivities to catechol at 2300, 5055, and 9280 A·M−1·m−2, respectively. We demonstrate here that pAu is an effective carrier of electroactive nanomaterials coupled with oxidases, which may be promising in biosensors.

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Section: Introductionmentioning

confidence: 99%

Highly Porous 3D Gold Enhances Sensitivity of Amperometric Biosensors Based on Oxidases and CuCe Nanoparticles

et al. 2022

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“…To this end, SERS measurement can be performed either below the stability threshold of the hot spots or on rationally designed hot spots with improved stability threshold. Here, we employed a light welding strategy developed by our group , to produce the completely welded Au NP film containing hot spots with less SERS activity but improved stability threshold. Figure A shows the SERS spectral sequences of the TP adsorbed on the welded Au NPs at an excitation power of 2.5 mW.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, it can produce high spectral reproducibility within a wider excitation power range (0–5 mW) than that (0–2.5 mW) for their parent unwelded Au NP film (Figure B). SEM studies reveal that the light welding process , can completely and selectively remove all the nanogaps in the Au NP film, forming a welded Au NP film with a continuous, highly interconnected network structure (Figure C). Its morphology shows no observable changes even upon SERS measurements under 632.8 nm excitation at a power of 5 mW for 500 s (Figure D).…”

Section: Resultsmentioning

confidence: 99%

“…Nevertheless, this problem, at least, may be partially addressed if we view the poor spectral reproducibility of SERS from a different perspective. Previously, we found that light from a Xe lamp can weld Au and Ag NPs at a water–air interface, , implying that hot spots may be instable during SERS measurement because of the use of laser as an excitation source. Here, we have systematically studied the influence of the stability of hot spots on SERS behaviors, which, to our knowledge, has not received intensive attention in previous studies.…”

Section: Introductionmentioning

confidence: 99%

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Can “Hot Spots” Be Stable Enough for Surface-Enhanced Raman Scattering?

Zhu

et al. 2021

J. Phys. Chem. C

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Because of the random distribution and nonuniform enhancement of hot spots, surface-enhanced Raman scattering (SERS) usually shows poor spectral reproducibility, which greatly limits its practical applications, especially quantitative SERS detection. Here, we report our finding that the instability of hot spots is also a key limiting factor for the poor spectral reproducibility of SERS. We show that hot spots show a stability threshold to the excitation power, duration, and wavelength. During SERS measurement, large spectral fluctuation is observed at or above a threshold power because the laser used reshapes (here, weld) the hot spots, causing a continuous decrease in SERS intensity. The threshold power also differs for different excitation wavelengths because of their different resonance extents with the plasmon of the hot spots. Finally, we show that a random SERS substrate can deliver much improved stable, reproducible SERS signals when lowering the excitation power below the threshold or deliberately removing the more unstable hot spots. These results offer a new understanding to the spectral reproducibility of SERS, greatly facilitating reliable SERS detection and the design of robust hot spots.

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“…38 In the Au/TiO 2 electrode, the photocurrent-onset potential drastically shifts to E ≈ 0 V with a current peak at E = +1.2 V due to oxide film formation. 46 This promoting effect of Au NPs can be called "plasmonic catalytic activity" for OER. As shown in Fig.…”

Section: Plasmonic Activity For Oermentioning

confidence: 99%

Rational design for gold nanoparticle-based plasmonic catalysts and electrodes for water oxidation towards artificial photosynthesis

Tada

2022

Dalton Trans.

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Light welding Au nanoparticles assembled at water-air interface for monolayered nanoporous gold films with tunable electrocatalytic activity

Cited by 10 publications

References 63 publications

Highly Porous 3D Gold Enhances Sensitivity of Amperometric Biosensors Based on Oxidases and CuCe Nanoparticles

Highly Porous 3D Gold Enhances Sensitivity of Amperometric Biosensors Based on Oxidases and CuCe Nanoparticles

Can “Hot Spots” Be Stable Enough for Surface-Enhanced Raman Scattering?

Rational design for gold nanoparticle-based plasmonic catalysts and electrodes for water oxidation towards artificial photosynthesis

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