科研之友
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摘要
In this sensing system, vitamin C (Vc) could reduce Hg2+ to Hg-0, which selectively deposited on the tips of gold nanorods (AuNRs) to form gold amalgamation due to the shielding effect of the surfactant cetyltrimethylammonium bromide (CAB) on the transverse site of AuNRs. As a result, the aspect ratio (length/width) of AuNRs was decreased and the morphology of AuNRs was changed. When the concentration of Vc was in the range of 0.11-85.0 mu M, the longitudinal plasmon absorption wavelength (LPAW, lambda(L)) blue shifted (Delta lambda(L)); while in the range of 85.0-385 mu M, the transversal plasmon absorption wavelength (TPAW, lambda(T)) red shifted (Delta lambda(T)) gradually, as well as the color of the solution changed obviously. Thus, a non-aggregation calorimetric sensor for rapid determination of Vc has been developed. The detection limit (LD) of this sensor is 3.5 x 10(-9) gVc mL(-1) for lambda(L) and 5.1 x 10(-6) gVc mL(-1) for lambda(T), respectively, which is much lower than that of aggregation colorimetric sensor, showing its great sensitivity. What's more, the sensor has been applied to the detecting of Vc in real samples with the results agreeing well with aggregation colorimetric sensor using lambda(L), showing its great practicality. At the same time, the structures of AuNRs were characterized by transmission electron microscope (TEM), and the sensing mechanism for the detection of Vc has been discussed.
- 出版日期2013-6
- 单位闽南师范大学
