Colorimetric determination of Cu2+ ions with a desktop scanner using silica nanoparticles via formation of a quinonediimine dye

Kim, Da Bin; Hong, Ja Min; Chang, Suk‐Kyu

doi:10.1016/j.snb.2017.06.033

Cited by 20 publications

(4 citation statements)

References 56 publications

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“…However, it is still well below the guideline limit suggested by the WHO (30 micromole). Moreover, the present method presents the broadest linearity range, with the exception of Si nanoparticles [34] which, however, show a much higher LOD. In fact, NS-CDs demonstrated the best trade-off between LOD and linearity range of all reported systems.…”

Section: Comparison With Other Sensing Systemsmentioning

confidence: 77%

Detection of Cu(II) in water by using N, S co-doped carbon dots

Bisauriya,

Antonaroli,

Cabibbo

et al. 2023

J. Phys.: Conf. Ser.

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Determination of Cu(II) ions in surface and drinking water is a high-priority issue both for the environment and human health. Here, we report on the preparation via a hydrothermal method of stable water suspensions of N and S co-doped carbon dots. This material demonstrated selective sensitivity to the presence of copper in water with the appearance of a characteristic absorption band at 658 nm resulting in a visual color variation from orange to dark brown. The colorimetric measurement, carried out by recording the difference between the absorbance at two wavelengths, showed a good linear dependence on the ion concentration from 1 to 100 μM with a lower limit of detection of 300 nM, significantly below the values set by health and environmental organizations. The sensing method is simply based on the addition of the contaminated sample to the carbon dot solution without any other reagents or previous treatment. Moreover, the sensing solution showed stability for at least 6 months after preparation.

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Section: Comparison With Other Sensing Systemsmentioning

confidence: 77%

Detection of Cu(II) in water by using N, S co-doped carbon dots

Bisauriya,

Antonaroli,

Cabibbo

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…The LOD of the present method (0.1 µM) is outperformed by that of other nanomaterial systems, e.g., Au nanoclusters [ 49 ], but it is still much lower than the guideline value set by the WHO (30 µM). On the other hand, the linearity range is broader than that of all of the other methods considered; the exception is the method described by Kim and collaborators [ 50 ] which, however, presented a significantly higher LOD (2 µM) and was based on the Cu(II)-assisted oxidative coupling of silica nanoparticle-supported aniline with 4-aminoantipyrine to form a chromogenic quinonediimine dye. In fact, most of the reported colorimetric methods rely on quite complex and time-consuming sensing procedures.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Sensing Properties of N and S Co-Doped Carbon Dots for Colorimetric Detection of Copper and Cobalt in Water

Bisauriya

Antonaroli

Ardini

et al. 2022

Sensors

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In this study, nitrogen and sulfur co-doped carbon dots (NS-CDs) were investigated for the detection of heavy metals in water through absorption-based colorimetric response. NS-CDs were synthesized by a simple one-pot hydrothermal method and characterized by TEM, STEM-coupled with energy dispersive X-ray analysis, NMR, and IR spectroscopy. Addition of Cu(II) ions to NS-CD aqueous solutions gave origin to a distinct absorption band at 660 nm which was attributed to the formation of cuprammonium complexes through coordination with amino functional groups of NS-CDs. Absorbance increased linearly with Cu(II) concentration in the range 1–100 µM and enabled a limit of detection of 200 nM. No response was observed with the other tested metals, including Fe(III) which, however, appreciably decreased sensitivity to copper. Increase of pH of the NS-CD solution up to 9.5 greatly reduced this interference effect and enhanced the response to Cu(II), thus confirming the different nature of the two interactions. In addition, a concurrent response to Co(II) appeared in a different spectral region, thus suggesting the possibility of dual-species multiple sensitivity. The present method neither requires any other reagents nor any previous assay treatment and thus can be a promising candidate for low-cost monitoring of copper onsite and by unskilled personnel.

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“…In retrospect, flatbed scanners have been explored for quantitative detection in various applications; for example, Soldat et al demonstrated that a scanner operating in transmittance mode can replace dedicated microplate readers in colorimetric assays and validated their design via quantifying nitrate ions [18]. Kim et al also used an office scanner as a signal-capture device to obtain digital image of microplates, then determined color values and process data manually using a computer software, finally realized the determination of Cu 2+ in simulated wastewater samples [19]. Independently, Meng et al reported a scanner-readable plastic microchip for the colorimetric quantitation of organophosphorous pesticides in food products [20].…”

Section: Introductionmentioning

confidence: 99%

A WiFi scanner in conjunction with disposable multiplex paper assay for the quantitation of disease markers in blood plasma

et al. 2021

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Herein we report a quantitative, multiplex assay for disease markers in plasma based on an integrated setup of a portable scanner and a disposable paper-based analytical device (PAD). The quantitative analysis relies on the digital colorimetric reading of the three-layer PAD with 30 assay sites for performing respective chromogenic reactions for plasma uric acid, glucose, and triglyceride, which are considered as important risk factors for cardiovascular diseases. A portable scanner with WiFi transmission capability was used to produce high-quality color images of the PADs and wirelessly transfer them to a smartphone or other mobile devices for data processing. The concentrations of biomarkers in both standard solutions and plasma samples can be directly obtained using a custom-designed smartphone app that is also capable of constructing calibration curves. The detection limits of uric acid, glucose, and triglyceride were determined to be 0.50 mg/dL, 0.84 mmol/L, and 14 mg/dL, respectively, which are below the normal limits and adequate for clinical validation. Owing to the distinct advantages-simple, portable, and costeffective-this mobile assay protocol can be used for point-of-care (POC) settings or resource-limited situations, and potentially for the diagnosis and prevention of infectious diseases.

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Colorimetric determination of Cu2+ ions with a desktop scanner using silica nanoparticles via formation of a quinonediimine dye

Cited by 20 publications

References 56 publications

Detection of Cu(II) in water by using N, S co-doped carbon dots

Detection of Cu(II) in water by using N, S co-doped carbon dots

Tuning the Sensing Properties of N and S Co-Doped Carbon Dots for Colorimetric Detection of Copper and Cobalt in Water

A WiFi scanner in conjunction with disposable multiplex paper assay for the quantitation of disease markers in blood plasma

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