Preparation of fluorescent bimetallic silver/copper nanoparticles and their utility of dual-mode fluorimetric and colorimetric probe for Hg2+

Pang, Jingyu; Xie, Ruyan; Chua, Sophie; Zou, Yu; Tang, Mingyu; Zhang, Fang; Chai, Fang

doi:10.1016/j.saa.2021.120035

Cited by 24 publications

(12 citation statements)

References 67 publications

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“…As we all know, the assay results from single-mode signal readout will be affected by operators, apparatus, and nonstandard analytical procedures. , In order to improve the accuracy and confidence of the assay, recently, dual-mode sensing methods have received wide attention due to the relatively independent signal transductions and different response mechanisms in different modes. This makes the dual-mode sensing platform not only have distinct properties of each mode but also can provide mutual authentication of detection results. − For example, Li et al designed a colorimetric and fluorescent dual-mode sensor for the determination of Hg 2+ to improve the accuracy of the sensor . However, till now, there is no work on the dual-mode assay of Hg 2+ based on the photocurrent-polarity-switching PEC method.…”

Section: Introductionmentioning

confidence: 99%

“…However, till now, there is no work on the dual-mode assay of Hg 2+ based on the photocurrent-polarity-switching PEC method. Additionally, colorimetry is a popular method in the analytical field owing to the cost-effectiveness, visualization with naked eye, and simplicity. , This has inspired us to design a novel dual-mode sensing platform for selective and accurate determination of Hg 2+ based on the photocurrent-polarity-switching PEC method and colorimetry.…”

Section: Introductionmentioning

confidence: 99%

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Colorimetric and Photocurrent-Polarity-Switching Photoelectrochemical Dual-Mode Sensing Platform for Highly Selective Detection of Mercury Ions Based on the Split G-Quadruplex–Hemin Complex

Zhang

et al. 2022

Anal. Chem.

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Mercury ion (Hg2+) is one of the most harmful heavy metal ions with the greatest impact on public health. Herein, based on the excellent catalytic activity toward 3,3′,5,5′-tetramethylbenzidine (TMB) and the strong photocurrent-polarity-switching ability to SnS2 photoanode of the split G-quadruplex–hemin complex, the magnetic NiCo2O4@SiO2–NH2 sphere-assisted colorimetric and photoelectrochemical (PEC) dual-mode sensing platform was developed for the Hg2+ assay. First, the amino-labelled single-stranded DNA1 (S1) was immobilized on NiCo2O4@SiO2–NH2 and then partly hybridized with another single-stranded DNA2 (S2). When Hg2+ was present, the thymine–Hg2+–thymine base pairs between S1 and S2 were formed, causing the formation of the split G-quadruplex in the presence of K+. After addition of hemin, the split G-quadruplex–hemin complex was obtained and effectually catalyzed the H2O2-mediated oxidation of TMB. Thus, the color and absorbance intensity of the TMB solution were changed, resulting in the visual and colorimetric detection of Hg2+. The linear response range is 10 pM to 10 nM, and the detection limit is 3.8 pM. Meanwhile, the above G-quadruplex–hemin complex effectively switched the photocurrent polarity of SnS2-modified indium tin oxide electrode, leading to the sensitive and selective PEC assay of Hg2+ with a linear response range of 5 pM to 500 nM and a detection limit of 2.3 pM. Moreover, the developed dual-mode sensing platform provided mutual authentication of detection results in different modes, effectively improving the assay accuracy and confidence, and may have a good potential application in highly sensitive, selective, and accurate determination of Hg2+ in environmental fields.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Colorimetric and Photocurrent-Polarity-Switching Photoelectrochemical Dual-Mode Sensing Platform for Highly Selective Detection of Mercury Ions Based on the Split G-Quadruplex–Hemin Complex

Zhang

et al. 2022

Anal. Chem.

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“…Despite significant progress in the synthesis of bimetallic silver–copper NPs, − the ability to control the bimetallic nanoclusters (NCs) and NPs remains a challenge. Often the presence of NCs makes it difficult to separate NCs from NPs.…”

Section: Introductionmentioning

confidence: 99%

Silver–Copper Alloy Nanoinks for Ambient Temperature Sintering

et al. 2022

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There is an increasing need to reduce the silver content in silver-based inks or pastes and achieve low-temperature sintering for scalable and low-cost production of printed wearable electronics. This need depends on the ability to control the metal composition and the surface properties of the nanoinks. Alloying silver with copper provides a pathway for meeting the need in terms of cost reduction, but little is known about the composition controllability and the low-temperature sintering capability. We report herein a scalable wet chemical synthesis of bimetallic silver–copper alloy nanoinks with room temperature sintering properties. The bimetallic alloy nanoparticles with a controllable composition can be formulated as stable nanoinks. The nanoinks printed on paper substrates are shown to sinter under room temperature. In addition to composition dependence, the results reveal an intriguing dependence of sintering on humidity above the printed nanoink films. These findings are assessed based on theoretical simulation of the sintering processes via surface-mediated sintering and interparticle necking mechanisms in terms of nanoscale adsorption, adhesion and diffusion, and surface free energies. Implications of the findings for room temperature fabrication of wearable sensors are also discussed.

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“…21 Considerable efforts have been made to design and synthesize noble metal NCs and utilize them as a probe for chemical and biological sensing, which provides a more concise and accurate strategy for sensing biological molecules. 22,23 Mostly blue and green emitting a Key Laboratory of Molecular Cytogenetics and Genetic Breeding, College of Life nanoclusters have been reported; for example, Pang et al reported a blue emissive bimetallic nanocluster for sensing. 24 Halawa et al synthesized b-cyclodextrin-functionalized AuNCs with green emission, which can be used to recognize DA with a limit of detection of 20.0 nM.…”

Section: Introductionmentioning

confidence: 99%

The controllable synthesis of orange-red emissive Au nanoclusters and their use as a portable colorimetric fluorometric probe for dopamine

Wu¹,

Ye²,

Xie³

et al. 2022

New J. Chem.

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Preparation of fluorescent bimetallic silver/copper nanoparticles and their utility of dual-mode fluorimetric and colorimetric probe for Hg2+

Cited by 24 publications

References 67 publications

Colorimetric and Photocurrent-Polarity-Switching Photoelectrochemical Dual-Mode Sensing Platform for Highly Selective Detection of Mercury Ions Based on the Split G-Quadruplex–Hemin Complex

Colorimetric and Photocurrent-Polarity-Switching Photoelectrochemical Dual-Mode Sensing Platform for Highly Selective Detection of Mercury Ions Based on the Split G-Quadruplex–Hemin Complex

Silver–Copper Alloy Nanoinks for Ambient Temperature Sintering

The controllable synthesis of orange-red emissive Au nanoclusters and their use as a portable colorimetric fluorometric probe for dopamine

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