Poly-cytosine-mediated nanotags for SERS detection of Hg2+

Lin Qi; Mingshu Xiao; Fei Wang; Lihua Wang; Wei Ji; Tiantian Man; Ali Aldalbahi; M. Naziruddin Khan; Govindasami Periyasami; Mostafizur Rahaman; Abdulaziz Alrohaili; Xiangmeng Qu; Hao Pei; Cheng Wang; Li Li

doi:10.1039/C7NR05165D

Poly-cytosine-mediated nanotags for SERS detection of Hg²⁺†

Lin Qi,‡^a Mingshu Xiao,‡^a Fei Wang,^b Lihua Wang,^b Wei Ji,^a Tiantian Man,^a Ali Aldalbahi,^c M. Naziruddin Khan,^e Govindasami Periyasami,^c Mostafizur Rahaman,^c Abdulaziz Alrohaili,^c Xiangmeng Qu,^a Hao Pei,

^a Cheng Wang^d and Li Li

*^a

Author affiliations

* Corresponding authors

^a Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai, P. R. China
E-mail: lli@chem.ecnu.edu.cn

^b Division of Physical Biology & Bioimaging Center, Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, P. R. China

^c Chemistry Department, King Saud University, Riyadh 11451, Saudi Arabia

^d Department of Nuclear Medicine, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, P. R. China

^e King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia

Abstract

Highly sensitive and selective detection of heavy metal ions, such as Hg²⁺, is of great importance because the contamination of heavy metal ions has been a serious threat to human health. Herein, we have developed poly-cytosine (polyC)-mediated surface-enhanced Raman scattering (SERS) nanotags as a sensor system for rapid, selective, and sensitive detection of Hg²⁺ based on thymidine–Hg²⁺–thymidine (T–Hg²⁺–T) coordination and polyC-mediated Raman activity. The SERS nanotags exploit the mismatched T–T base pairs to capture Hg²⁺ form T–Hg²⁺–T bridges, which induce the aggregation of nanotags giving rise to the drastic amplification in the SERS signals. Moreover, this polyC not only provides the anchoring function to induce the formation of intrinsic silver–cytosine coordination but also engineers the Raman-activity of SERS nanotags by mediating its length. As a result, the polyC-mediated SERS nanotags show an excellent response for Hg²⁺ in the concentration range from 0.1 to 1000 nM and good selectivity over other metal ions. Given its simple principle and easy operation, the polyC-mediated SERS nanotags, therefore, could serve as a promising sensor for practical use.

Nanoscale

Poly-cytosine-mediated nanotags for SERS detection of Hg²⁺†

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Poly-cytosine-mediated nanotags for SERS detection of Hg²⁺

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