Polyamine-Functionalized Carbon Quantum Dots as Fluorescent Probes for Selective and Sensitive Detection of Copper Ions

Dong, Yongqiang; Wang, Ruixue; Li, Geli; Chen, Congqiang; Chi, Yuwu; Chen, Guonan

doi:10.1021/ac3012126

Cited by 926 publications

(474 citation statements)

References 27 publications

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“…Two different linear relationships, one between the peak shift and Cu 2+ concentrations (1.0 to 20 nM, Figure 3C) and the other between the peak shift and logarithm of Cu 2+ concentrations (20 to 10 5 nM, Figure 3D), were respectively obtained. The detection limit was calculated to be 0.5 nM according to the S/N = 3 rule, which is lower than that of other nanoparticles and quantum-dot-based sensors, [7][8][9][10][11]17,18,28 and is comparable to the results obtained by AAS, AES, ICPMS, and anodic/cathodic stripping voltammetry (Table 1). 29−35 Digital photographs ( Figure 3E) show that the color of the GNR solutions changed from blue to red and even to colorless with increasing Cu 2+ content.…”

Section: ■ Results and Discussionsupporting

confidence: 72%

Highly Sensitive Visual Detection of Copper Ions Based on the Shape-Dependent LSPR Spectroscopy of Gold Nanorods

Zhang

Chen²,

Qu³

et al. 2014

Langmuir

127

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ABSTRACT:We have developed a novel approach to the rapid visual detection of Cu 2+ in natural samples based on the copper-mediated leaching of gold nanorods (GNRs). In the presence of hexadecyltrimethylammonium bromide, which can reduce the redox potential of Au(I)/ Au, the GNRs are catalytically etched by Cu 2+ preferentially along the longitudinal direction. And as a result, the localized surface plasmon resonance extinction peak shifts to short wavelength, accompanied by a color change from blue to red. The leaching mechanism has been carefully discussed in a series of control experiments. Under optimal conditions, this sensor exhibits good sensitivity (LOD = 0.5 nM). Most importantly, the approach is highlighted by its high selectivity for and tolerance of interference, which enables the sensor to detect Cu 2+ directly in a complex matrix, especially in seawater. Moreover, such a nanoparticle-based sensor is also successfully applied to test paper for the visual detection of Cu 2+ .

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Section: ■ Results and Discussionsupporting

confidence: 72%

Highly Sensitive Visual Detection of Copper Ions Based on the Shape-Dependent LSPR Spectroscopy of Gold Nanorods

Zhang

Chen²,

Qu³

et al. 2014

Langmuir

127

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“…As shown in Fig. 4a and b, a good linear correlation was obtained between the quenching efficiency and the concentration of copper ion from 0.2 to 10 M. And the detection limit of biosensor pyoverdine to copper ion was up to 50 nM (signal to noise ratio equal to 3.0), which was equal with the established copper ion fluorescence probes by polyamine-functionalized carbon quantum dots and pyoverdine-similar chemosensors [14,36,37]. The results indicated that the developed biosensor can detect copper ion with satisfied sensitivity.…”

Section: Sensitivity and Selectivity Of Our Biosensor For The Detectisupporting

confidence: 55%

A sensitive fluorescent biosensor for the detection of copper ion inspired by biological recognition element pyoverdine

Yin

Wang

et al. 2016

Sensors and Actuators B: Chemical

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a b s t r a c tThe environmental copper pollution seriously threatens the health of organisms and the safety of ecosystem. Therefore, the development of a simple and sensitive method to detect copper ion is very important. In this study, we have developed a fluorescent biosensor based on biological recognition element pyoverdine to selectively detect copper ion. The fluorescence of pyoverdine is quenched obviously after binding with copper ion. A good linearity within the range of 0.2-10 M (R = 0.997) is attained and the detection limit is 50 nM. The biosensor has been successfully utilized for the detection of copper ion in drinking water, seawater and bio-samples and the results agree well with those obtained by the inductively coupled plasma mass spectrometry. Therefore, the established biosensor is a creditable method to detect copper ion with high sensitivity and selectivity, which can be utilized as a powerful tool to monitor copper pollution in the environment.

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“…6,8 C-dot-based sensors have several advantages: (1) they exhibit high sensitivity toward various targets; (2) the sensing method is usually simple and free of reagents; and (3) the change in their fluorescence signal is very fast, which enables a very short response time. [9][10][11][12] Porous silicon (PSi) and oxidized PSi (PSiO 2 ) have emerged in recent years as attractive and versatile nanomaterials for sensing applications. 13,14 PSi exhibits attractive, tunable properties that contribute to its use as a biosensor.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

et al. 2018

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A new hybrid guest-host material consisting of a Fabry-Pérot porous silicon (PSi) thin film, a nanostructured high surface-area matrix, and encapsulated fluorescent carbon quantum dots (C-dots) is described. The hybrid is synthesized by a facile in situ pyrolysis treatment of the carbonaceous precursor incorporated within the nanoscale pores of the inorganic host. The effects of nanoconfinement on the integrity of the C-dots and their optical properties are characterized. We show that the resulting hybrid allows for label-free optical detection of target molecules using two orthogonal modalities, that is, the white-light reflectivity of the PSi matrix and the fluorescence of the confined C-dots, and these two signals can be observed and collected simultaneously. The resulting hybrid system exhibits superior sensing performance in comparison with that of the individual components. Notably, we demonstrate that the confined C-dots exhibit greater sensitivity toward various analytes as well as an improved linear response, thus providing evidence of the impact of the host nanoscale porous scaffold on the optical properties of the C-dots. Moreover, we show that this orthogonal detection scheme increases the dynamic range of the sensor and minimizes falsenegative results.

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Polyamine-Functionalized Carbon Quantum Dots as Fluorescent Probes for Selective and Sensitive Detection of Copper Ions

Cited by 926 publications

References 27 publications

Highly Sensitive Visual Detection of Copper Ions Based on the Shape-Dependent LSPR Spectroscopy of Gold Nanorods

Highly Sensitive Visual Detection of Copper Ions Based on the Shape-Dependent LSPR Spectroscopy of Gold Nanorods

A sensitive fluorescent biosensor for the detection of copper ion inspired by biological recognition element pyoverdine

Synthesis and characterization of a nanostructured porous silicon/carbon dot-hybrid for orthogonal molecular detection

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