Chem. J. Chinese Universities ›› 2017, Vol. 38 ›› Issue (11): 1993.doi: 10.7503/cjcu20170519

• Physical Chemistry • Previous Articles     Next Articles

Highly Sensitive Colorimetric Sensing for Cu2+ by Inverse Opals of Photonic Crystal Hydrogels

LIU Shirong*(), QIN Liyan, ZHANG Xiaodong, CHEN Mingqing   

  1. Key Laboratory of Synthetic and Biological Colloids, Ministry of Education,School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
  • Received:2017-07-31 Online:2017-11-10 Published:2017-10-30
  • Contact: LIU Shirong E-mail:liushirong1@aliyun.com
  • Supported by:
    † Supported by the National Natural Science Foundation of China(No.21571084)

Abstract:

Inverse opals of photonic crystal hydrogels(PCHs) composed of acrylamide(AM) and N-vinyl imidazole(NVI) copolymers were fabricated for the specific detection of Cu2+. A “sandwich” structure was used to control the precursor infiltration in order to endow PCHs with highly ordered three-dimensional interconnected macroporous structure. The acquired PCHs produced the characteristic Bragg diffraction peak when immersed into Cu2+ buffers, and exhibited a rapid response. With the increase of concentration of Cu2+ from 0 mol/L to 10-4 mol/L, Bragg diffraction peak of PCHs blueshifted 66 nm and the color change was visible to the naked eyes(from brown to kelly green). Furthermore, PCHs exhibited efficient recognition to Cu2+ in the multicomponent metal ion solution. Such a specific recognition, rapid response and signal self-reporting of PCHs to Cu2+ provide great potential for the real-time monitor of Cu2+.

Key words: “Sandwich”, structure, Inverse opals, Photonic crystals, Hydrogels, Detection of Cu2+

CLC Number: 

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