Effect of visible and UV irradiation on the aggregation stability of CdTe quantum dots

Tsipotan, A. S.; Gerasimova, M. A.; Aleksandrovsky, A.S.; Жарков, С. М.; Slabko, V. V.

doi:10.1007/s11051-016-3638-0

Cited by 6 publications

(13 citation statements)

References 22 publications

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“…Several research works have already been reported on the response of metallic QDs to UV irradiation [32,33,[52][53][54]. Conversely, no illumination was observed when QDs were exposed to low-energy infrared radiation, and exposure of QDs to high-energy radiation such as X-rays leads to QD damage [52].…”

Section: Discussionmentioning

confidence: 99%

“…Derfus et al [33] reported the release of free Cd 2+ ions from cadmium selenide (CdSe) QDs in the presence of UV radiation as a consequence of QDs surface oxidation. It was found that CdTe QDs also respond to UV radiation [6,32,52,53]. UV exposure causes the release of Cd 2+ ions from the CdTe QD surface.…”

Section: Discussionmentioning

confidence: 99%

“…The radiation induces the aggregation of nanoparticles as observed in our study. Tsipotan et al [32] examined the influence of irradiation by UV as well as by visible light on the photostimulated aggregation of CdTe QDs stabilised by TGA. In our study, MSA as a stabiliser of CdTe QDs was used, and a pronounced aggregation of these QDs after seven-day UV irradiation in an environment experiment was observed (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

“…Current applications of QDs are widespread, and their use as fluorescent labels in biological tests is one of the most promising [31]. Tsipotan et al examined the effect of visible light and UV radiation on the aggregation stability of CdTe QDs [32]. In the case of ultraviolet light, photoinduced reduction of CdTe QDs size was confirmed.…”

Section: Introductionmentioning

confidence: 99%

“…Over the past two decades, considerable efforts have been made to develop QD-based fluorescence probes and sensors [15,[35][36][37][38]. In order to obtain an optimum quantum efficiency, the following stabilisers are commonly used: thioglycolic acid (TGA) [32,39,40], glutathione (GSH) [41], mercaptosuccinic acid (MSA) [42], 3-mercaptopropionic acid (MPA) [43] and L-cysteine [44,45]. CdTe QDs are known to possess a high fluorescence efficiency and good stability [46].…”

Section: Introductionmentioning

confidence: 99%

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Study of Physico-Chemical Changes of CdTe QDs after Their Exposure to Environmental Conditions

Hosnedlová

Všetičková

Staňková³

et al. 2020

Nanomaterials

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The irradiance of ultraviolet (UV) radiation is a physical parameter that significantly influences biological molecules by affecting their molecular structure. The influence of UV radiation on nanoparticles has not been investigated much. In this work, the ability of cadmium telluride quantum dots (CdTe QDs) to respond to natural UV radiation was examined. The average size of the yellow QDs was 4 nm, and the sizes of green, red and orange QDs were 2 nm. Quantum yield of green CdTe QDs-MSA (mercaptosuccinic acid)-A, yellow CdTe QDs-MSA-B, orange CdTe QDs-MSA-C and red CdTe QDs-MSA-D were 23.0%, 16.0%, 18.0% and 7.0%, respectively. Green, yellow, orange and red CdTe QDs were replaced every day and exposed to daily UV radiation for 12 h for seven consecutive days in summer with UV index signal integration ranging from 1894 to 2970. The rising dose of UV radiation led to the release of cadmium ions and the change in the size of individual QDs. The shifts were evident in absorption signals (shifts of the absorbance maxima of individual CdTe QDs-MSA were in the range of 6–79 nm), sulfhydryl (SH)-group signals (after UV exposure, the largest changes in the differential signal of the SH groups were observed in the orange, green, and yellow QDs, while in red QDs, there were almost no changes), fluorescence, and electrochemical signals. Yellow, orange and green QDs showed a stronger response to UV radiation than red ones.

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