Brominated Graphene as Mimetic Peroxidase for Sulfide Ion Recognition

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• 作者：Shikha Singh ; Kheyanath Mitra ; Aparna Shukla ; Rajshree Singh ; Ravi Kumar Gundampati ; Nira Misra ; Pralay Maiti ; Biswajit Ray
• 刊名：Analytical Chemistry
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：89
• 期：1
• 页码：783-791
• 全文大小：612K
• ISSN：1520-6882

文摘

Brominated graphene (GBR) with ∼3% bromine content has shown novel peroxidase mimetic activity toward 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H₂O_2. Optimum activity has been observed at pH 4.48 and after a minimum ∼30 min of equilibration time. Among the different analytes studied using the sensor combining TMB, H₂O₂, and GBR in phosphate buffer of pH 4.48, the S^2– ion has effectively shown a short duration of sensing (∼2 min) within the detection range of 0.04–1 mM. A calibration curve for S^2– ion estimation has been constructed with the experimental linearity in 0.04–0.4 mM range and having the limit of detection (LOD) value of 25.3 μM. A standard addition experiment has validated the method. A paper strip sensor has been fabricated for successful detection of S^2– ion.