A sensitive plasmonic copper(II) sensor based on gold nanoparticles deposited on ITO glass substrate.
Gold nanoparticles (Au NPs) based plasmonic probe was developed for sensitive and selective detection of Cu(2+) ion. The Au NPs were self-assembled on transparent indium tin oxide (ITO) film coated glass substrate using poly dimethyl diallyl ammonium chloride (PDDA) as a linker and then calcined at 400°C to obtain pure Au NPs on ITO surface (ITO/Au NPs). The probe was fabricated by functionalizing l-cysteine (Cys) on to gold surface (ITO/Au NPs/Cys). The strong chelation of Cu(2+) with Cys formed a stable Cys-Cu complex, and resulted in the red-shift of localized surface plasmon resonance (LSPR) peak of the Au NPs. The introduction of bovine serum albumin (BSA) as the second complexant could form complex of Cys-Cu-BAS and further markedly enhanced the red-shift of the LSPR peak. This plasmonic probe provided a highly sensitive and selective detection towards Cu(2+) ions, with a wide linear detection range (10(-11)-10(-5)M) over 6 orders of magnitude. The simple and cost-effective probe was successfully applied to the determination of Cu(2+) in real samples.
College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou 215123, PR China.
Lijun
L
Ding
College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou 215123, PR China.
Yan
Y
Gao
College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou 215123, PR China. Electronic address: djw@suda.edu.cn.
Junwei
J
Di
D000818:Animals; D002417:Cattle; D003300:Copper / Q000032:analysis*; D003545:Cysteine / Q000737:chemistry; D060766:Drinking Water / Q000032:analysis; D005898:Glass / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008892:Milk / Q000737:chemistry; D045483:Rivers / Q000737:chemistry; D012710:Serum Albumin, Bovine / Q000737:chemistry; D020349:Surface Plasmon Resonance / Q000379:methods*; D017971:Tin Compounds / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
D060766:Drinking Water; D017971:Tin Compounds; D014874:Water Pollutants, Chemical; D012710:Serum Albumin, Bovine; C109984:indium tin oxide; D006046:Gold; D003300:Copper; D003545:Cysteine
Calcination; Cu(II) ions; Gold nanoparticle arrays; Plasmonic sensor; Self-assembly