Evaluations of the chemical stability and cytotoxicity of CuInS2 and CuInS2/ZnS core/shell quantum dots

Chieh Wei Chen, Dai Ying Wu, Yung Chieh Chan, Chun Che Lin, Po Hsiang Chung, Michael Hsiao, Ru Shi Liu

研究成果: 雜誌貢獻文章同行評審

62 引文 斯高帕斯(Scopus)

摘要

Recently, CuInS2 quantum dots (CIS QDs) are extensively applied in biological applications because of their distinctive optical property. These novel ternary semiconductor CIS QDs can be developed into good biomarkers or trackers because they do not contain cadmium, unlike CdTe and CdSe QDs with high risk for cytotoxicity. However, reports on toxicity and effective factors affecting CIS QDs are seldom developed, and in vivo chemical stability has not been clearly investigated. In this study, we focused on the fate, degradation, and exposure time of CIS QDs in Caenorhabditis elegans (C. elegans), which is used as a model organism in biology. Moreover, X-ray absorption near-edge structure (XANES) is used to identify the oxidation state of CIS and CIS/ZnS QDs in various exposure times. The purpose was to use different oxidation states of copper and zinc ions of QDs to achieve chemical stability in C. elegans. CIS and CIS/ZnS QDs were synthesized by hydrothermal method, and QDs were transferred to aqueous solution by coating with O-carboxymethylchitosan (OCMCS). Moreover, intracellular uptake and cell viability tests were estimated as preliminary experiments for in vitro cytotoxicity testing. Our results showed that the supported QD materials can be applied in biological systems. Consequently, we further considered the function of QD materials in C. elegans. The QD materials of coating OCMCS could be successfully delivered to the interior of the C. elegans through the alimentary system in a manner dependent on the exposure time. Most importantly, XANES results revealed that the oxidative state of CIS QDs did not change without an outer layer after treatment for 96 h in C. elegans. Therefore, the extreme chemical stability of CIS QDs may explain the low cytotoxicity in the organism and thus has potential biomedical applications.
原文英語
頁(從 - 到)2852-2860
頁數9
期刊Journal of Physical Chemistry C
119
發行號5
DOIs
出版狀態已發佈 - 1月 1 2015
對外發佈

ASJC Scopus subject areas

  • 物理與理論化學
  • 電子、光磁材料
  • 表面、塗料和薄膜
  • 能源(全部)

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