Silver ion modulated CdS quantum dots for highly selective detection of trace Hg2+

Uppa, Yuwapon; Kulchat, Sirinan; Ngamdee, Kessarin; Pradublai, Kaewklao; Tuntulani, Thawatchai; Ngeontae, Wittaya

doi:10.1016/j.jlumin.2016.06.001

Cited by 15 publications

(6 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the past few decades, QDs have attracted considerable attention due to their special properties, and CdS QDs are one of the most studied QDs which are composed of semiconductors of atoms from groups II–VI [ 38 ]. There is much research information which can be searched and obtained from various sources regarding the preparation, properties, and applications of QDs [ 39 , 40 , 41 , 42 , 43 , 44 ]. Cadmium sulfide-based QDs (CdS QDs) are promising materials for optics, optoelectronics, medicine, and sensor technology development [ 45 , 46 , 47 , 48 ].…”

Section: Introductionmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

et al. 2021

View full text Add to dashboard Cite

In this study, X-ray photoelectron spectroscopy (XPS) was used to study chitosan–graphene oxide (chitosan–GO) incorporated with 4-(2-pyridylazo)resorcinol (PAR) and cadmium sulfide quantum dot (CdS QD) composite thin films for the potential optical sensing of cobalt ions (Co2+). From the XPS results, it was confirmed that carbon, oxygen, and nitrogen elements existed on the PAR–chitosan–GO thin film, while for CdS QD–chitosan–GO, the existence of carbon, oxygen, cadmium, nitrogen, and sulfur were confirmed. Further deconvolution of each element using the Gaussian–Lorentzian curve fitting program revealed the sub-peak component of each element and hence the corresponding functional group was identified. Next, investigation using surface plasmon resonance (SPR) optical sensor proved that both chitosan–GO-based thin films were able to detect Co2+ as low as 0.01 ppm for both composite thin films, while the PAR had the higher binding affinity. The interaction of the Co2+ with the thin films was characterized again using XPS to confirm the functional group involved during the reaction. The XPS results proved that primary amino in the PAR–chitosan–GO thin film contributed more important role for the reaction with Co2+, as in agreement with the SPR results.

show abstract

Section: Introductionmentioning

confidence: 99%

X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Basically, pH value acts an important role in the present fluorescence sensors system, which can influence the deprotonation or protonation process of the CA-CdS QDs [73]. In this work, the charge on the surface of the QDs would up to the degree of deprotonation of the carboxyl groups and may influence the electron-hole recombination process, thereby causing the fluorescence quenching.…”

Section: Resultsmentioning

confidence: 99%

Citric Acid Capped CdS Quantum Dots for Fluorescence Detection of Copper Ions (II) in Aqueous Solution

et al. 2018

View full text Add to dashboard Cite

Citric acid capped CdS quantum dots (CA-CdS QDs), a new assembled fluorescent probe for copper ions (Cu2+), was synthesized successfully by a simple hydrothermal method. In this work, the fluorescence sensor for the detection of heavy and transition metal (HTM) ions has been extensively studied in aqueous solution. The results of the present study indicate that the obtained CA-CdS QDs could detect Cu2+ with high sensitivity and selectivity. It found that the existence of Cu2+ has a significant fluorescence quenching with a large red shifted (from greenish-yellow to yellowish-orange), but not in the presence of 17 other HTM ions. As a result, Cu2S, the energy level below the CdS conduction band, could be formed at the surface of the CA-CdS QDs and leads to the quenching of fluorescence of CA-CdS QDs. Under optimal conditions, the copper ions detection range using the synthesized fluorescence sensor was 1.0 × 10‒8 M to 5.0 × 10‒5 M and the limit of detection (LOD) is 9.2 × 10‒9 M. Besides, the as-synthesized CA-CdS QDs sensor exhibited good selectivity toward Cu2+ relative to other common metal ions. Thus, the CA-CdS QDs has potential applications for detecting Cu2+ in real water samples.

show abstract

“…109,132,148 Doping other metal ions enhances the QY of QDs. 112,149 Uppa et al 150 enhanced the fluorescence of cysteamine capped-CdS quantum dots using the silver ion (Ag + @Cys-CdS QDs), which was quenched by the Hg 2+ ion. The fluorescence quenching was based on the metallophilic interaction between Hg 2+ and Ag + (on the Cys-CdS QD surface).…”

Section: Fluorescence Quenching By Analyte Through Direct Attachment ...mentioning

confidence: 99%

Recent advances in II–VI group semiconductor- and carbon-based quantum dots for fluorescence-based sensing of metal ions in water

Das,

Somu,

Yadav

et al. 2024

Environ. Sci.: Nano

View full text Add to dashboard Cite

show abstract

Silver ion modulated CdS quantum dots for highly selective detection of trace Hg2+

Cited by 15 publications

References 44 publications

X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

X-ray Photoelectron Spectroscopy Analysis of Chitosan–Graphene Oxide-Based Composite Thin Films for Potential Optical Sensing Applications

Citric Acid Capped CdS Quantum Dots for Fluorescence Detection of Copper Ions (II) in Aqueous Solution

Recent advances in II–VI group semiconductor- and carbon-based quantum dots for fluorescence-based sensing of metal ions in water

Contact Info

Product

Resources

About