| Summary: | 碩士 === 國立臺北科技大學 === 化學工程研究所 === 102 === Herein, we report a template free and surfactant less electrochemical approach for the preparation of flower-like yttrium hexacyanoferrate (YHCF) particles on reduced graphene oxide (RGO) modified glassy carbon electrode (GCE). The morphology of YHCF particles has been controlled by varying the molar ratio of Y(NO3)2 and K3Fe(CN)6 for the first time. The surface morphology of as-prepared RGO/YHCF composite was characterized using SEM, EDX, IR and XRD methods. The electrocatalytic activity of the RGO/YHCF composite modified GCE towards paracetamol (PA) oxidation has been investigated by using cyclic voltammetry (CV) and linear sweep voltammetry (LSV). Besides, the practical feasibility of the fabricated modified GCE has been demonstrated through the determination of PA from commercially purchased paracetamol tablets.
First time we developed a facile electrochemical route for the synthesis of Lutetium hexacyanoferrate (LuHCF) building of stars like structure. The controlled synthesis of LuHCF particles having star like structure with average size of 7 + 8 μm. The LuHCF micro stars building is decorated on graphene oxide (GO) modified GCE. The electrochemical route is continued for the preparation of LuHCF/reduced graphene oxide (RGO) composite modified GCE. The size and morphology of the as synthesised LuHCF micro stars were controlled by depositing time. The LuHCF micro stars building was characterized by scanning electron microscopy (SEM), Infra-red spectroscopy, and energy dispersive spectroscopy. The charge transfer resistant value of LuHCF/RGO/GCE has smaller than LuHCF and unmodified GCE. The composite modified GCE has excellent electro catalytic activity towards salicylic acid (SA). The electro catalytic measurements were performed with cyclic voltammetry and amperometric methods. The detection limit and sensitivity of the SA sensor has been calculated as 0.49 μA and 77.2 μA mM-1cm-2 respectively. The reported GCE has excellent real time application with commercially purchased aspirin tablets and salicylic acid ointment. Moreover, the reported composite has long term storage stability.
Herein, we report highly sensitive amperometric nicotine (NIC) sensor using composite of palladium hexacyanoferrate (PdHCF) with graphene oxide (GO) modified GCE. The PdHCF particle was deposited using electrochemical route. The electro catalytic measurements and surface morphology of the as prepared composite was studied using cyclic voltammetry (CV), amperometry, electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (FESEM) respectively. This PdHCF incorporated GO composite modified GCE (PdHCF/GO) exhibits a prominent electro catalytic activity towards the voltammetric determination of NIC. The presence of the GO in the film enhances the surface coverage concentration and also increases the electron transfer rate constant, of the PdHCF nanoparticles. The modified electrode shows the linear range of 8 μM to 240 μM for NIC. The sensitivity has been found as 1.208 μA μM-1cm-2. Moreover the proposed film has long term stability.
|
|---|
