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  Journal of Nanoscience Letters 2014, 4: 19
  Research Article
Self-referenced detection of Cu2+ using a crossbar array of protein-stabilized gold nanocluster and a thermoplastic [Retracted by the Authors from Journal of Nanoscience Letters and re-submitted to our Science Letters. See for its publication in Science Letters]
  Junfei Xiaa, Zhibin Wanga, Danting Huanga, Peipei Zhanga, Brett Kirklanda, Jingjiao Guana,b  
a Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Florida State University, Tallahassee, Florida 32310, USA
b Integrative NanoScience Institute, Florida State University, Tallahassee, Florida 32306, USA

  A simple strategy has been developed to construct a micrometer-sized self-referenced fluorescence sensor for detecting Cu2+. The method relies on microcontact printing of bovine serum albumin-stabilized gold nanocluster (BSA-AuNC) and poly(propyl methacrylate) (PPMA) stripes on a glass slide. The PPMA stripes are printed on the BSA-AuNC stripes to form a crossbar array, with its cell unit being composed of four distinct regions: BSA-AuNC, plain glass, PPMA, and BSA-AuNC covered by PPMA. The BSA-AuNC region is fluorescent and its fluorescence intensity is changeable upon contacting with analyte solution. The BSA-AuNC covered by PPMA is also fluorescent but insensitive to the analyte solution due to the presence of PPMA which prevents the analyte solution from contacting the BSA-AuNC. This region can thus be used as an internal reference for sensing. This self-referenced sensor is able to detect Cu2+ in a highly specific and concentration-dependent manner.
  Ion sensor; Microcontact printing; Bovine serum albumin; Gold nanocluster; Copper ion  

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