Solvent-mediated in situ growth and assembly of gold nanoparticles@carbon dots for rapid colorimetric nonenzymatic alcohol sensing

Tong, Chaoying; Tong, Xia; Cao, Yuanxin; Cai, Guihan; Wang, Tongtao; Wei, Qisheng; Shi, Shuyun; Guo, Ying

doi:10.1016/j.carbon.2022.04.070

Cited by 10 publications

(4 citation statements)

References 43 publications

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“…In the visible light region, (Y, O, R)-CDs exhibit wide absorption bands at around 425, 435, and 534 nm, respectively. This is due to the different surface state transitions and doping levels of B and N atoms in (Y, O, R)-CDs . The above results indicate that (Y, O, R)-CDs contain a large amount of sp 2 C, and with the emission red shift, the absorption of sp 2 carbon becomes significantly stronger.…”

Section: Resultsmentioning

confidence: 88%

“…This is due to the different surface state transitions and doping levels of B and N atoms in (Y, O, R)-CDs. 43 The above results indicate that (Y, O, R)-CDs contain a large amount of sp 2 C, and with the emission red shift, the absorption of sp 2 carbon becomes significantly stronger. In addition, the absorption bands of (Y, O, R)-CDs in the low energy region overlap with their fluorescence excitation spectra, indicating that the yellow, orange, and red fluorescence emissions of (Y, O, R)-CDs originate from the transition of the absorption bands in the low energy region.…”

Section: Characterization Of (Y O R)-cds As Shown Inmentioning

confidence: 75%

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Rapid Preparation of Long-Wavelength Emissive Carbon Dots for Information Encryption Using the Microwave-Assisted Method

et al. 2023

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The synthesis of long-wavelength emission fluorescent carbon dots is not common, and it is even more difficult to quickly synthesize within 10 min. In this experiment, yellow, orange, and red B, N codoped fluorescent carbon dots were successfully synthesized using a microwave-assisted method with o-phenylenediamine as the carbon–nitrogen source, boric acid as the boron source, and potassium chloride as the catalyst in just 7 min. Based on the different contents of B, N element doping, there are differences in their surface structures, resulting in differences in the luminescence properties of the synthesized carbon dots. Long-wavelength carbon dots can avoid interference from the blue fluorescence of filter papers and have a clearer display in information encryption. Therefore, three types of carbon dots were mixed with PVP to produce fluorescent inks, and anticounterfeiting and encryption patterns were designed on the filter paper, displaying different fluorescence information under sunlight and UV light. In addition, the rich fluorescent colors were combined ingeniously to enable secondary encryption of information in the form of binary codes that increase the difficulty of decoding. These indicate that the three synthesized long-wavelength carbon dots have good application prospects in information encryption.

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Section: Resultsmentioning

confidence: 88%

Section: Characterization Of (Y O R)-cds As Shown Inmentioning

confidence: 75%

Rapid Preparation of Long-Wavelength Emissive Carbon Dots for Information Encryption Using the Microwave-Assisted Method

et al. 2023

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“…The comparison of diffraction peaks confirmed that the CQDs-AuNPs synthesized through a one-pot method indeed possessed a face-centered cubic structure, consistent with the reference pattern (JCPDS No. 04–0784). − During the synthesis process, the crystalline structure of CQDs-AuNPs becomes more pronounced, and due to the relatively lower concentration of CQDs, the XRD pattern predominantly displays the crystalline form of CQDs-AuNPs (Figure A). Before the introduction of Au 3+ ions, the XRD analysis revealed a distinct peak for CQDs at 2θ = 22°, indicative of a graphite-like structure (Figure S1A).…”

Section: Resultsmentioning

confidence: 99%

“…04–0784). 32 − 34 During the synthesis process, the crystalline structure of CQDs-AuNPs becomes more pronounced, and due to the relatively lower concentration of CQDs, the XRD pattern predominantly displays the crystalline form of CQDs-AuNPs ( Figure 3 A). Before the introduction of Au 3+ ions, the XRD analysis revealed a distinct peak for CQDs at 2θ = 22°, indicative of a graphite-like structure ( Figure S1A ).…”

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Carbon Quantum Dots and Carbon Quantum Dot-Gold Nanoparticles for Applications in Bacterial Imaging and Catalytic Reduction of Aromatic Nitro Compounds

Fang,

Chang,

et al. 2024

ACS Omega

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This study delves into the green synthesis and multifaceted applications of three types of carbon quantum dots (CQDs), namely, CQDs-1, CQDs-2, and CQDs-3. These CQDs were innovatively produced through a gentle pyrolysis process from distinct plant-based precursors: genipin with glucose for CQDs-1, genipin with extracted gardenia seeds for CQDs-2, and genipin with whole gardenia seeds for CQDs-3. Advanced analytical techniques, including X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FT-IR), were employed to detail the CQDs' structural and surface characteristics, revealing their unique functional groups and surface chemistries. The study further explores the CQDs' bioimaging potential, where confocal fluorescence microscopy evidenced their swift uptake by Escherichia coli bacteria, indicating their suitability for bacterial imaging. These CQDs were also applied in the synthesis of gold nanoparticles (AuNPs), acting as reducing agents and stabilizers. Among these, CQD3-AuNPs were distinguished by their remarkable stability and catalytic efficiency, achieving a 99.7% reduction of 4-nitrophenol to 4-aminophenol in just 10 min and maintaining near-complete reduction efficiency (99.6%) after 60 days. This performance notably surpasses that of AuNPs synthesized using sodium citrate, underscoring the exceptional capabilities of CQD3-AuNPs. These insights pave the way for leveraging CQDs and CQD-stabilized AuNPs in bacterial imaging and catalysis, presenting valuable directions for future scientific inquiry and practical applications. ■ HIGHLIGHTS • Three unique CQDs were synthesized through a singlestep mild pyrolysis process. • CQDs-3 exhibit maximum quantum yield of 4.0%. • Rapid internalization of CQDs into E. coli was confirmed through vivid three-color confocal fluorescence microscopy. • CQDs are used as both reducing agents and stabilizers in the synthesis of AuNPs. • CQD3-AuNPs reduce 99.7% of 4-NP to 4-AP within 10 min, maintaining 99.6% reduction efficiency after 60 days.

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New insight into interference-free and highly sensitive dopamine electroanalysis

Kamaha Tchekep,

Suryanarayanan,

Pattanayak

2024

Analytica Chimica Acta

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Solvent-mediated in situ growth and assembly of gold nanoparticles@carbon dots for rapid colorimetric nonenzymatic alcohol sensing

Cited by 10 publications

References 43 publications

Rapid Preparation of Long-Wavelength Emissive Carbon Dots for Information Encryption Using the Microwave-Assisted Method

Rapid Preparation of Long-Wavelength Emissive Carbon Dots for Information Encryption Using the Microwave-Assisted Method

Green Synthesis of Carbon Quantum Dots and Carbon Quantum Dot-Gold Nanoparticles for Applications in Bacterial Imaging and Catalytic Reduction of Aromatic Nitro Compounds

New insight into interference-free and highly sensitive dopamine electroanalysis

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