Kumar Vijay, Gupta Rajeev Kumar, Gundampati Ravi Kumar, Singh Devendra Kumar, Mohan Sweta, Hasan Syed Hadi, Malviya Manisha
Nanomaterial Research Laboratory, Department of Chemistry, Indian Institute of Technology (BHU) Varanasi-221005 U.P. India
Fuel Cell Technology, Department of Chemistry, Indian Institute of Technology (BHU) Varanasi-221005 U.P. India
RSC Adv. 2018 Jan 4;8(2):619-631. doi: 10.1039/c7ra11466d. eCollection 2018 Jan 2.
The current study aims at the development of an electrochemical sensor based on a silver nanoparticle-reduced graphene oxide-polyaniline (AgNPs-rGO-PANI) nanocomposite for the sensitive and selective detection of hydrogen peroxide (HO). The nanocomposite was fabricated by simple synthesis of PANI at the surface of rGO sheet which was followed by stirring with AEC biosynthesized AgNPs to form a nanocomposite. The AgNPs, GO, rGO, PANI, rGO-PANI, and AgNPs-rGO-PANI nanocomposite and their interaction were studied by UV-vis, FTIR, XRD, SEM, EDX and XPS analysis. AgNPs-rGO-PANI nanocomposite was loaded (0.5 mg cm) on a glassy carbon electrode (GCE) where the active surface area was maintained at 0.2 cm for investigation of the electrochemical properties. It was found that AgNPs-rGO-PANI-GCE had high sensitivity towards the reduction of HO than AgNPs-rGO which occurred at -0.4 V SCE due to the presence of PANI (AgNPs have direct electronic interaction with N atom of the PANI backbone) which enhanced the rate of transfer of electron during the electrochemical reduction of HO. The calibration plots of HO electrochemical detection was established in the range of 0.01 μM to 1000 μM ( = 0.99) with a detection limit of 50 nM, the response time of about 5 s at a signal-to-noise ratio (S/N = 3). The sensitivity was calculated as 14.7 μA mM cm which indicated a significant potential as a non-enzymatic HO sensor.
当前的研究旨在开发一种基于银纳米颗粒还原氧化石墨烯-聚苯胺（AgNPs-rGO-PANI）纳米复合材料的电化学传感器，用于灵敏且选择性地检测过氧化氢（H₂O₂）。该纳米复合材料是通过在rGO片表面简单合成聚苯胺，随后与AEC生物合成的AgNPs搅拌形成纳米复合材料而制备的。通过紫外可见光谱、傅里叶变换红外光谱、X射线衍射、扫描电子显微镜、能谱分析和X射线光电子能谱分析对AgNPs、GO、rGO、PANI、rGO-PANI和AgNPs-rGO-PANI纳米复合材料及其相互作用进行了研究。将AgNPs-rGO-PANI纳米复合材料（0.5 mg/cm²）负载在玻碳电极（GCE）上，其中活性表面积保持为0.2 cm²，以研究其电化学性质。结果发现，由于聚苯胺的存在（AgNPs与聚苯胺主链的N原子有直接电子相互作用），AgNPs-rGO-PANI-GCE对H₂O₂还原的灵敏度高于AgNPs-rGO，H₂O₂在 -0.4 V（相对于饱和甘汞电极）发生还原，这提高了H₂O₂电化学还原过程中的电子转移速率。H₂O₂电化学检测的校准曲线在0.01 μM至1000 μM范围内建立（R² = 0.99），检测限为50 nM，在信噪比（S/N = 3）下响应时间约为5 s。灵敏度计算为14.7 μA mM⁻¹ cm⁻²，这表明其作为非酶H₂O₂传感器具有巨大潜力。
