Photoelectrochemical detection of copper ions by modulating the growth of CdS quantum dots

Ruta Grinyte; Javier Barroso; Beatriz Díez-Buitrago; Laura Saa; Marco Möller; Valeri Pavlov

doi:10.1016/j.aca.2017.08.008

Photoelectrochemical detection of copper ions by modulating the growth of CdS quantum dots

Ruta Grinyte
, Javier Barroso
, Beatriz Díez-Buitrago
, Laura Saa
, Marco Möller
, Valeri Pavlov^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We discovered that copper ions (Cu²⁺) catalyze the oxidation of cysteine (CSH) by oxygen (O₂) to modulate the growth of CSH-capped cadmium sulfide (CdS) nanoparticles (NPs). This new chemical process was applied to sensitive fluorogenic and photoelectrochemical (PEC) detection of Cu²⁺ ions in real samples of mineral and tap water using the photocatalytic activity of the resulting NPs. Disposable screen-printed electrodes (SPCEs) modified with electroactive polyvinylpyridine bearing osmium complex (Os-PVP) by cyclic voltammetry (CV) were employed for PEC analytical system. CdS NPs formed during the assay photocatalyze oxidation of 1-thioglycerol (TG) upon application of 0.3 V vs. Ag/AgCl to SPCEs. Os-PVP complex mediated the electron transfer between the electrode surface and CdS NPs. We proved that our assays did not suffer from interference from other ions accompanying Cu²⁺ and the sensitivity of our assays covers the European Union standard limit of Cu²⁺ ions in drinking water.

Original language	English
Pages (from-to)	42-47
Number of pages	6
Journal	Analytica Chimica Acta
Volume	986
DOIs	https://doi.org/10.1016/j.aca.2017.08.008
Publication status	Published - 15 Sept 2017
Externally published	Yes

Keywords

Copper
Cysteine
Fluorescence
Photoelectrochemistry
Quantum dots

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10.1016/j.aca.2017.08.008

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@article{546393e5883843f2a0a6db8040967741,

title = "Photoelectrochemical detection of copper ions by modulating the growth of CdS quantum dots",

abstract = "We discovered that copper ions (Cu2+) catalyze the oxidation of cysteine (CSH) by oxygen (O2) to modulate the growth of CSH-capped cadmium sulfide (CdS) nanoparticles (NPs). This new chemical process was applied to sensitive fluorogenic and photoelectrochemical (PEC) detection of Cu2+ ions in real samples of mineral and tap water using the photocatalytic activity of the resulting NPs. Disposable screen-printed electrodes (SPCEs) modified with electroactive polyvinylpyridine bearing osmium complex (Os-PVP) by cyclic voltammetry (CV) were employed for PEC analytical system. CdS NPs formed during the assay photocatalyze oxidation of 1-thioglycerol (TG) upon application of 0.3 V vs. Ag/AgCl to SPCEs. Os-PVP complex mediated the electron transfer between the electrode surface and CdS NPs. We proved that our assays did not suffer from interference from other ions accompanying Cu2+ and the sensitivity of our assays covers the European Union standard limit of Cu2+ ions in drinking water.",

keywords = "Copper, Cysteine, Fluorescence, Photoelectrochemistry, Quantum dots",

author = "Ruta Grinyte and Javier Barroso and Beatriz D{\'i}ez-Buitrago and Laura Saa and Marco M{\"o}ller and Valeri Pavlov",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2017",

month = sep,

day = "15",

doi = "10.1016/j.aca.2017.08.008",

language = "English",

volume = "986",

pages = "42--47",

journal = "Analytica Chimica Acta",

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TY - JOUR

T1 - Photoelectrochemical detection of copper ions by modulating the growth of CdS quantum dots

AU - Grinyte, Ruta

AU - Barroso, Javier

AU - Díez-Buitrago, Beatriz

AU - Saa, Laura

AU - Möller, Marco

AU - Pavlov, Valeri

PY - 2017/9/15

Y1 - 2017/9/15

N2 - We discovered that copper ions (Cu2+) catalyze the oxidation of cysteine (CSH) by oxygen (O2) to modulate the growth of CSH-capped cadmium sulfide (CdS) nanoparticles (NPs). This new chemical process was applied to sensitive fluorogenic and photoelectrochemical (PEC) detection of Cu2+ ions in real samples of mineral and tap water using the photocatalytic activity of the resulting NPs. Disposable screen-printed electrodes (SPCEs) modified with electroactive polyvinylpyridine bearing osmium complex (Os-PVP) by cyclic voltammetry (CV) were employed for PEC analytical system. CdS NPs formed during the assay photocatalyze oxidation of 1-thioglycerol (TG) upon application of 0.3 V vs. Ag/AgCl to SPCEs. Os-PVP complex mediated the electron transfer between the electrode surface and CdS NPs. We proved that our assays did not suffer from interference from other ions accompanying Cu2+ and the sensitivity of our assays covers the European Union standard limit of Cu2+ ions in drinking water.

AB - We discovered that copper ions (Cu2+) catalyze the oxidation of cysteine (CSH) by oxygen (O2) to modulate the growth of CSH-capped cadmium sulfide (CdS) nanoparticles (NPs). This new chemical process was applied to sensitive fluorogenic and photoelectrochemical (PEC) detection of Cu2+ ions in real samples of mineral and tap water using the photocatalytic activity of the resulting NPs. Disposable screen-printed electrodes (SPCEs) modified with electroactive polyvinylpyridine bearing osmium complex (Os-PVP) by cyclic voltammetry (CV) were employed for PEC analytical system. CdS NPs formed during the assay photocatalyze oxidation of 1-thioglycerol (TG) upon application of 0.3 V vs. Ag/AgCl to SPCEs. Os-PVP complex mediated the electron transfer between the electrode surface and CdS NPs. We proved that our assays did not suffer from interference from other ions accompanying Cu2+ and the sensitivity of our assays covers the European Union standard limit of Cu2+ ions in drinking water.

KW - Copper

KW - Cysteine

KW - Fluorescence

KW - Photoelectrochemistry

KW - Quantum dots

UR - https://www.scopus.com/pages/publications/85028077586

U2 - 10.1016/j.aca.2017.08.008

DO - 10.1016/j.aca.2017.08.008

M3 - Article

C2 - 28870324

AN - SCOPUS:85028077586

SN - 0003-2670

VL - 986

SP - 42

EP - 47

JO - Analytica Chimica Acta

JF - Analytica Chimica Acta

ER -

Photoelectrochemical detection of copper ions by modulating the growth of CdS quantum dots

Abstract

Keywords

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