Luminescence Emission of Copper Nanoclusters by Ethanol-induced Aggregation and Aluminum Ion-induced Aggregation

Citation: GUO Xiaohong, ZHOU Ying, SHI Lihong, ZHANG Yan, ZHANG Caihong, DONG Chuan, ZHANG Guomei, SHUANG Shaomin. Luminescence Emission of Copper Nanoclusters by Ethanol-induced Aggregation and Aluminum Ion-induced Aggregation[J]. Acta Physico-Chimica Sinica, 2018, 34(7): 818-824. doi: 10.3866/PKU.WHXB201712081 shu

基于乙醇和铝离子聚集诱导的铜纳米团簇

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山西大学化学化工学院，环境科学研究所，太原 030006

通讯作者: 张国梅, gmzhang@sxu.edu.cn
双少敏, smshuang@sxu.edu.cn

基金项目:
山西省重点研发计划 201703D321031

国家自然科学基金(21475080，21571116，21575084)，山西省高等学校中青年拔尖创新人才计划(TYMIT)，山西省百人计划项目，山西省青年科学基金(201701D221029)，山西省重点研发计划(201703D321031)资助

山西省高等学校中青年拔尖创新人才计划 TYMIT

国家自然科学基金 21575084

山西省青年科学基金 201701D221029

国家自然科学基金 21571116

国家自然科学基金 21475080

摘要: 金属纳米团簇(MNCs)作为一种新型的纳米材料，具有合成方法简单、光稳定性强、毒性低、生物相容性好以及发光效率高等优点。在本研究中，使用“一锅法”合成谷胱甘肽保护的铜纳米团簇。在激发波长为370 nm时，GS@CuNCs的荧光发射波长在610 nm左右。铜纳米团簇可以通过有溶剂诱导和阳离子诱导两种方法聚集诱导增强其荧光强度。通过测定在不同溶剂(乙醇、甲醇、N, N-二甲基甲酰胺)中铜纳米团簇的荧光强度，探究了溶剂极性对聚集的影响。研究结果表明：在水溶液中铜纳米团簇只发射弱的荧光，随着乙醇含量从0%到85%，其荧光强度逐渐增强。此外，我们开发了一种新的选择性好、灵敏性高的检测铝离子的荧光探针。线性范围为2–20 μmol·L^-1，且检测限(LOD)为33 nmol·L^-1。进一步探究可得，乙醇和铝离子能使GS@CuNCs荧光强度显著增加的机理为聚集诱导荧光增强。

关键词:

English

Luminescence Emission of Copper Nanoclusters by Ethanol-induced Aggregation and Aluminum Ion-induced Aggregation

School of Chemistry and Chemical Engineering, Institute of Environmental Science, Shanxi University, Taiyuan 030006, P. R. China

Corresponding author: ZHANG Guomei, gmzhang@sxu.edu.cn SHUANG Shaomin, smshuang@sxu.edu.cn

Received Date: 03 November 2017
Accepted Date: 04 December 2017
Revised Date: 04 December 2017
Available Online: 15 July 2018
Fund Project:

The project was supported by the National Natural Science Foundation of China (21475080, 21571116, 21575084), Program for the Top Young and Middle-aged Innovative Talents of Higher Learning Institutions of Shanxi Province, China (TYMIT), Shanxi Province Hundred Talent Project, the Youth Science Foundation of Shanxi Province, China (201701D221029) and Primary Research and Development Plan of Shanxi Province, China (201703D321031)

Abstract: Metal nanoclusters (MNCs), as a new type of nano-material, possess excellent properties such as facile synthesis, strong light stability, low toxicity, excellent biocompatibility, and high luminous efficiency. Aggregation-induced emission (AIE), which can enhance the luminescence properties of MNCs, has resulted in MNCs attracting significant attention. In this thesis, L-glutathione (GSH)-protected copper nanoclusters (GS@CuNCs) were prepared by a "one-pot" method in aqueous solution without additional reducing agents. The GS@CuNCs were characterized by UV-Vis absorption spectroscopy and fluorescence spectroscopy. Upon excitation at 370 nm, the fluorescence spectrum of GS@CuNCs displayed the maximum emission peak at 610 nm. The as-prepared CuNCs generate a striking fluorescence intensity via aggregation-induced emission (AIE). The AIE property of GS@CuNCs was examined for the aggregates in different organic solvents, such as ethanol, methanol, and dimethylformamide. Since the aggregation degree was controlled by the content of organic solvent, we further measured the fluorescence intensity of GS@CuNCs in different volume ratios of a water-ethanol mixture solution. The fluorescence intensity of GS@CuNCs exhibited an approximately 30-fold increase at 85% of ethanol content, as compared to that in aqueous solution. A possible mechanism may be that intramolecular motions are restricted in ethanol, resulting in a significant increase of fluorescence intensity. Moreover, only very weak emissions were recorded for the CuNC dispersion in aqueous solution; however, an apparent luminescence enhancement was observed in both luminescence spectra and by naked eyes under UV light, with a gradual increase in the ethanol content in the water-ethanol mixture from 0% to 85%. Additionally, we developed a new selective and sensitive turn-on fluorescent sensor for the detection of trivalent aluminum ions (Al³⁺) based on cation-induced aggregation methods. Among the 15 types of metal cations studied, only Al³⁺ visibly increased the fluorescence emission of the GS@CuNCs. These results indicated that the GS@CuNCs were highly selective to Al³⁺ than other metal ions, which may result from the electrostatic and coordination interactions between the trivalent aluminum ions and monovalent carboxylic anions from GSH in the CuNCs. The response of the probe to Al³⁺ exhibited a good linear range of 2–20 μmol·L^-1 and the detection limit was 33 nmol·L^-1. Thus, the weak fluorescence intensity of CuNCs was increased markedly by the AIE of Al³⁺, and could construct an interesting fluorescent platform for sensing aluminum ions. The property of AIE of GS@CuNCs may expand the potential applications of nanocluster materials to biosensors and cell imaging.

Key words:

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

基于乙醇和铝离子聚集诱导的铜纳米团簇

通讯作者: 张国梅, gmzhang@sxu.edu.cn
双少敏, smshuang@sxu.edu.cn

English

Luminescence Emission of Copper Nanoclusters by Ethanol-induced Aggregation and Aluminum Ion-induced Aggregation

Corresponding author: ZHANG Guomei, gmzhang@sxu.edu.cn SHUANG Shaomin, smshuang@sxu.edu.cn

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

基于乙醇和铝离子聚集诱导的铜纳米团簇

通讯作者: 张国梅, gmzhang@sxu.edu.cn 双少敏, smshuang@sxu.edu.cn

English

Luminescence Emission of Copper Nanoclusters by Ethanol-induced Aggregation and Aluminum Ion-induced Aggregation

Corresponding author: ZHANG Guomei, gmzhang@sxu.edu.cn SHUANG Shaomin, smshuang@sxu.edu.cn

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

通讯作者: 张国梅, gmzhang@sxu.edu.cn
双少敏, smshuang@sxu.edu.cn

CCS Chemistry：颜徐州、鲍哲南：你的皮肤可能是一片SPMs