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Carbon-based electrodes are being used widely nowadays for biosensor applications, primarily owing to their good electrical conductivity and ease of functionalization. At the same time, the increasing demand for the low cost, disposable and the ease of availability for the do-it-yourself assemblies have provided an opportunity to look beyond conventional carbon materials for electrochemical analysis. In recent time, the pencil lead, entitled as the pencil graphite has been used as an electrodedoi:10.1149/2.0202003jes fatcat:xj7ajdhqt5edtnio2bkcrucwqa