A colorimetric sensor based on catechol-terminated mixed self-assembled monolayers modified gold nanoparticles for ultrasensitive detections of copper ions.
A colorimetric sensor for Cu(II) ions has been developed based on mixed self-assembled monolayers (SAMs) modified gold nanoparticles (AuNPs). The AuNPs were modified with mixed SAMs consisting of mercaptosuccinic acid and the product of electrochemically triggered Michael addition reaction of 4-thiouracil and catechol. In the presence of Cu(II) ions, the coordination of Cu(2+) to catechol-terminated AuNPs leads to aggregation-induced changes of surface plasmon resonance. The cost-effective chemical sensor allows rapid, sensitive and selective detection of Cu(2+) ions, indicating its potential application in environmental field.
Department of Chemistry, East China Normal University, Shanghai 200062, China.
Siqiu
S
Ye
Xinhao
X
Shi
Wei
W
Gu
Yixuan
Y
Zhang
Yuezhong
Y
Xian
D002396:Catechols / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003124:Colorimetry; D003300:Copper / Q000032:analysis* / Q000737:chemistry; D004563:Electrochemistry; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D013438:Sulfhydryl Compounds / Q000737:chemistry; D013870:Thiomalates / Q000737:chemistry
D002396:Catechols; D004785:Environmental Pollutants; D013438:Sulfhydryl Compounds; D013870:Thiomalates; D006046:Gold; D003300:Copper; C046062:2-thiomalic acid; C034221:catechol