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首页> 外文期刊>RSC Advances >Facile and green synthesis of graphene oxide by electrical exfoliation of pencil graphite and gold nanoparticle for non-enzymatic simultaneous sensing of ascorbic acid, dopamine and uric acid
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Facile and green synthesis of graphene oxide by electrical exfoliation of pencil graphite and gold nanoparticle for non-enzymatic simultaneous sensing of ascorbic acid, dopamine and uric acid

机译：通过铅笔状石墨和金纳米颗粒的电剥落轻松而绿色地合成氧化石墨烯，用于非酶同时感测抗坏血酸，多巴胺和尿酸

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摘要

Pencil graphite is electrochemically exfoliated to obtain few layered graphene oxide (GO) in hydrochloric acid (HCl, HGO), sodium hydroxide (NaOH, NGO) and phosphate buffer saline (PBS, pH 7.4, PGO) media at a constant potential (+7.0 V) without ionic liquid for the first time. Thus, obtained graphene oxide is deposited (by drop casting and electro reduction) onto a glassy carbon electrode (GCE). Following this, gold nanoparticles (AuNP) are electro deposited to form a GO-AuNP composite for simultaneous discrimination of dopamine (DA), ascorbic acid (AA) and uric acid (UA) at pH 7.4. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques reveal well separated oxidation peaks for DA, AA and UA. The sensor surfaces are characterized by ultraviolet visible (UV-vis), photoluminescence (PL), X-ray diffraction (XRD), contact angle goniometry (CA) and scanning electron microscopy (SEM) techniques. DA, AA and UA are studied individually to evaluate the dynamic ranges and lowest detection limits of the sensor by the DPV method. Concentrations of DA, AA and UA in real samples viz., dopamine injection, vitamin C tablets and human urine are evaluated.
机译：在恒定电位（+7.0）的盐酸（HCl，HGO），氢氧化钠（NaOH，NGO）和磷酸盐缓冲盐水（PBS，pH 7.4，PGO）介质中对铅笔状石墨进行电化学剥落以获得很少的层状氧化石墨（GO） V）第一次没有离子液体。因此，将获得的氧化石墨烯沉积（通过滴铸和电还原）到玻璃碳电极（GCE）上。之后，电沉积金纳米颗粒（AuNP）以形成GO-AuNP复合材料，用于同时区分pH 7.4的多巴胺（DA），抗坏血酸（AA）和尿酸（UA）。循环伏安法（CV）和微分脉冲伏安法（DPV）技术揭示了DA，AA和UA的良好分离的氧化峰。传感器表面的特征在于紫外可见光（UV-vis），光致发光（PL），X射线衍射（XRD），接触角测角（CA）和扫描电子显微镜（SEM）技术。分别研究了DA，AA和UA，以通过DPV方法评估传感器的动态范围和最低检测极限。评估了真实样品（即多巴胺注射液，维生素C片剂和人尿）中DA，AA和UA的浓度。

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