Highly sensitive and selective fluoride ion sensors based on microcantilevers modified with hydrogels.
We have developed two microcantilever sensors, one modified with chitosan/gelatin hydrogels doped with CH3(OCH2CH2)3OTBDPS and another modified with chitosan-OTBDPS/gelatin hydrogels, for the sensitive and selective detection of fluoride ions (F-) in aqueous solution. Upon exposure to F-, the microcantilevers underwent bending deflection due to the cleavage of Si-O bond on reacting with F- in the hydrogel. The results show that the maximum bending deflections are proportional to the concentrations of F-, and the limits of detection are 10(-8) M and 10(-9) M for the two microcantilevers, respectively. Other ions, such as Cl-, Br-, NO3-, H2PO4-, HSO4-, and AcO- have little effect on the deflection of the microcantilevers. The results show that the microcantilever may be used for in situ quantitative detection of F- in an aqueous solution and the mechanism of the bending are discussed.
Rong-Peng
RP
Peng
Xiao-Jun
XJ
Wang
Ling-Bao
LB
Xing
Cheng-Juan
CJ
Wu
Bin
B
Chen
Hai-Feng
HF
Ji
Li-Zhu
LZ
Wu
Chen-Ho
CH
Tung
D000838:Anions / Q000032:analysis; D005459:Fluorides / Q000032:analysis*; D020100:Hydrogels / Q000737:chemistry*; D057230:Limit of Detection; D055616:Microtechnology / Q000295:instrumentation* / Q000379:methods*
D000838:Anions; D020100:Hydrogels; D005459:Fluorides