硫化銅銦量子點合成、結構鑑定及其於線蟲體內穩定度探討

Synthesis, structural characterization of CuInS2 quantum dots and its chemical stability in Caenorhabditis Elegans

吳岱穎(Dai-Ying Wu)

指導教授 ： 劉如熹

國立臺灣大學/理學院/化學研究所/碩士(2014年)

https://doi.org/10.6342/NTU.2014.00017

摘要

新穎性奈米材料硫化銅銦量子點為近年來之主要研究目標。然此類量子點之毒性研究仍處於細胞毒性相關領域，較鮮少為人們於多細胞體系生物體中進行長時間消化與累積之探討，且於先前研究指出具銅元素之量子點其銅離子於生物體中仍具有生理與毒性之傷害。
於本研究中，使用水熱法合成硫化銅銦與包覆硫化鋅之量子點，其中硫化銅銦量子點放光波長於近紅外光範圍(700 nm)，經由硫化鋅修飾後其放光波長藍位移至620 nm，且放光強度增強約十倍左右。
於生物應用，本研究使用具修飾羧基之甲殼素藉由超音波震盪使其均勻包覆於量子點外層，反應後之水溶性量子點之形貌呈現類似圓型團簇(cluster)之現象，其放光紅位移至700 nm左右。於生物毒性測試上，本研究選用子宮頸癌(Hela)與口腔癌(OECM)細胞進行in vivo相關實驗，藉以測試不同劑量之量子點於細胞毒性之影響。另外，於多細胞生物體系，本研究選用秀麗隱桿線蟲(Caenorhabditis elegans, C. elegans)作為簡單多細胞生物作為實驗模型，藉由不同時間點觀察量子點於線蟲體內累積多寡與分部分析量子點可能影響之位置，並由X光近邊緣吸收光譜(XANES)量測不同時間點之量子點之氧化態變化，分析其於線蟲體內化學穩定度與影響，並於吸收光譜中發現其吸收峰與其標準品相似，證實其於短時間與長時間消化作用下量子點並無明顯分解現象，推論其於長時間生物消化作用下本研究所選用之量子點仍可保持其化學穩定度並維持其低生物毒性之特性。

關鍵字

量子點 ； 硫化銅銦 ； 線蟲 ； 近邊緣吸收光譜

並列摘要

Novel nano material CuInS2 quantum dots have been the major research these years. However, these kinds quantum dots’ nano toxicity were only studied in cell cytotoxicity, seldom studied about long term digestion and accumulation effects in multi-cellular organism. In previous research, they point out that quantum dots content copper element will release copper cation into organism to be harmful and toxic in long term accumulation.
In our research, we synthesis CuInS2 and ZnS shell nanoparticle by hydrothermal method. Their wavelength is located at around near infrared region (700 nm). After coating ZnS shell the wavelength will be blue shift to 620 nm, and their emission intensity will be enhance ten times.
For biological application, we use carboxylate-modified chitosan coat outside the nanoparticle uniformly by ultra-sonication. After sonication, the quantum dots’ morphology will be change to “cluster-like” circle shape, and the wavelength is red shift to 700 nm. In biological toxicity effects, we select Hela and OECM cancer cell for in vitro to test nanoparticle cytotoxicity effects in different dots. Moreover, we select Caenorhabditis elegans (C. elegans) to be the simple multi-cellular organism model to analysis the accumulation location and possible influence location inside the elegans body. To confirm the nanoparticle chemical stability, we use X-ray Absorption Near Edge Spectra (XANES) to characterize nanoparticle chemical oxidation to analysis the decomposition extent inside the elegans body. From the XANES results, it can be confirm that quantum dots did not show significant decomposition phenomenon. We can conclude that CIS and CIS/ZnS quantum dots are still stable and low cytotoxicity in C. elegans after long term digestion.

並列關鍵字

quantum dots ； CuInS2 ； XANES

參考文獻

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