| Blue-to-Red Colorimetric Sensing Strategy for Hg2+ and Ag+ via Redox-Regulated Surface Chemistry of Gold Nanoparticles | |
Lou, Tingting1,2; Chen, Zhaopeng1 ; Wang, Yunqing1; Chen, Lingxin1
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| 发表期刊 | ACS APPLIED MATERIALS & INTERFACES
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| ISSN | 1944-8244 |
| 2011-05-01 | |
| 卷号 | 3期号:5页码:1568-1573 |
| 关键词 | Gold Nanopartilces Colorimetric Detection "blue-to-red" Strategy Mercury Ion Silver Ion |
| 产权排序 | [Lou, Tingting; Chen, Zhaopeng; Wang, Yunqing; Chen, Lingxin] Chinese Acad Sci, Key Lab Coastal Environm Proc, Shandong Prov Key Lab Coastal Zone Environm Proc, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China; [Lou, Tingting] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 通讯作者 | Chen, LX, Chinese Acad Sci, Key Lab Coastal Environm Proc, Shandong Prov Key Lab Coastal Zone Environm Proc, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R [email protected] |
| 作者部门 | 环境化学实验室 |
| 英文摘要 | Here we report a "blue-to-red" colorimetric method for determination of mercury ions (Hg2+) and silver ions (Ag+) based on stabilization of gold nanoparticles (AuNPs) by redox formed metal coating in the presence of ascorbic acid (AA). AuNPs were first stabilized by Tween 20 in phosphate buffer solution with high ionic strength. In a target ion-free system, the addition of N-acetyl-L-cysteine resulted in the aggregation of Tween 20 stabilized AuNPs for mercapto ligand self-assembled on the surface of AuNPs, which induced the AuNPs to be unstable. This would lead to a color change from red to blue. By contrast, in an aqueous solution with Hg2+ or Ag+, the ions could be reduced with the aid of AA to form Hg-Au alloy or Ag coating on the surface of AuNPs. This metal coating blocked mercapto ligand assembly and AuNPs kept monodispersed after addition of N-acetyl-L-cysteine, exhibiting a red color. Therefore, taking advantage of this mechanism, a "blue-to-red" colorimetric sensing strategy could be established for He2+ and Ag+ detection. Compare with the commonly reported aggregation-based method ('red-to-blue'), the color change from blue to red seems more eye-sensitive, especial in low concentration of target. Moreover, selective analysis of Hg2+ and Ag+ was simply achieved by the redox nature of target ions and the application of classic ion masking agents, avoiding the design and selection of ion chelating moieties and complicated gold surface modification procedure. This method could selectively detect Hg2+ and Ag+ as low as 5 nM and 10 nM in pure water with a linear range of 5 x 10(-7) to 1 x 10(-5) M for Hg2+ and 1 x 10(-6) to 8 x 10(-6) M for Ag+, respectively. It was successfully applied to determination of Hg2+ and Ag+ in tap water and drinking water.; Here we report a "blue-to-red" colorimetric method for determination of mercury ions (Hg2+) and silver ions (Ag+) based on stabilization of gold nanoparticles (AuNPs) by redox formed metal coating in the presence of ascorbic acid (AA). AuNPs were first stabilized by Tween 20 in phosphate buffer solution with high ionic strength. In a target ion-free system, the addition of N-acetyl-L-cysteine resulted in the aggregation of Tween 20 stabilized AuNPs for mercapto ligand self-assembled on the surface of AuNPs, which induced the AuNPs to be unstable. This would lead to a color change from red to blue. By contrast, in an aqueous solution with Hg2+ or Ag+, the ions could be reduced with the aid of AA to form Hg-Au alloy or Ag coating on the surface of AuNPs. This metal coating blocked mercapto ligand assembly and AuNPs kept monodispersed after addition of N-acetyl-L-cysteine, exhibiting a red color. Therefore, taking advantage of this mechanism, a "blue-to-red" colorimetric sensing strategy could be established for He2+ and Ag+ detection. Compare with the commonly reported aggregation-based method ('red-to-blue'), the color change from blue to red seems more eye-sensitive, especial in low concentration of target. Moreover, selective analysis of Hg2+ and Ag+ was simply achieved by the redox nature of target ions and the application of classic ion masking agents, avoiding the design and selection of ion chelating moieties and complicated gold surface modification procedure. This method could selectively detect Hg2+ and Ag+ as low as 5 nM and 10 nM in pure water with a linear range of 5 x 10(-7) to 1 x 10(-5) M for Hg2+ and 1 x 10(-6) to 8 x 10(-6) M for Ag+, respectively. It was successfully applied to determination of Hg2+ and Ag+ in tap water and drinking water. |
| 文章类型 | Article |
| 资助机构 | Department of Science and Technology of Shandong Province of China [2008GG20005005]; National Natural Science Foundation of China [20975089]; Chinese Academy of Sciences [KZCX2-EW-206]; Department of Science and Technology of Yantai City of China [2010158] |
| 收录类别 | SCI |
| 语种 | 英语 |
| 关键词[WOS] | PLASMA-MASS SPECTROMETRY ; CATALYTIC BEACONS ; INORGANIC MERCURY ; AQUEOUS-SOLUTIONS ; BASE-PAIRS ; DNA ; IONS ; APTAMERS ; ACID ; OLIGONUCLEOTIDES |
| 研究领域[WOS] | Science & Technology - Other Topics ; Materials Science |
| WOS记录号 | WOS:000290843800028 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.yic.ac.cn/handle/133337/4835 |
| 专题 | 中国科学院海岸带环境过程与生态修复重点实验室_海岸带环境工程技术研究与发展中心 中国科学院海岸带环境过程与生态修复重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Coastal Environm Proc, Shandong Prov Key Lab Coastal Zone Environm Proc, Yantai Inst Coastal Zone Res, Yantai 264003, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lou, Tingting,Chen, Zhaopeng,Wang, Yunqing,et al. Blue-to-Red Colorimetric Sensing Strategy for Hg2+ and Ag+ via Redox-Regulated Surface Chemistry of Gold Nanoparticles[J]. ACS APPLIED MATERIALS & INTERFACES,2011,3(5):1568-1573. |
| APA | Lou, Tingting,Chen, Zhaopeng,Wang, Yunqing,&Chen, Lingxin.(2011).Blue-to-Red Colorimetric Sensing Strategy for Hg2+ and Ag+ via Redox-Regulated Surface Chemistry of Gold Nanoparticles.ACS APPLIED MATERIALS & INTERFACES,3(5),1568-1573. |
| MLA | Lou, Tingting,et al."Blue-to-Red Colorimetric Sensing Strategy for Hg2+ and Ag+ via Redox-Regulated Surface Chemistry of Gold Nanoparticles".ACS APPLIED MATERIALS & INTERFACES 3.5(2011):1568-1573. |
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