Gold leaf electrochemical sensors: applications and nanostructure modification

Abstract

This work presents the first planar three-electrode electrochemical sensor comprising local gold leaf as the working electrode and printed, or hand-drawn, counter and reference electrodes, respectively. The gold leaf was...

Rapid Detection of Staphylococcus aureus Using Paper-Derived Electrochemical Biosensors

“…, electrochemical impedance spectroscopy or differential pulse voltammetry), the overall resistivity of the substrate may also impact the analytical performance of the sensor when other techniques (such as CV) are used. While several authors have described the use of gold leaf as an inexpensive material toward the fabrication of electrodes, − we selected vapor deposition considering the increased practicality, reproducibility, and speed of the method. It is important to mention that for these experiments, only a small amount of gold (35 μg/cm 2 ) was required to significantly decrease the lateral resistance of the paper-derived carbon electrodes (<1 Ω, from the contact point to the middle of the detection spot, see Figure ).…”

Recent advances in gold electrode fabrication for low-resource setting biosensing

“…Pure gold leaf sheets are extremely thin, affordable sheets of gold that cost $51.87 per 25 (14 cm × 14 cm) sheets. 86 Pure gold leaf has been used to make electrodes, [87][88][89][90][91][92][93][94][95] using equipment-free fabrication (Fig. 5).…”

Frontiers in Voltammetry

“…When studying the electrosensing applications of NPs, transfer of electrons between substrate and active site of enzyme (biocatalyst) forms the basis for the functioning of enzymatic biosensors, and this transfer in turn is transduced to produce an electroanalytical signal [81]. Carbon nanostructures, nanotubes, nanorods, ceramic or polymeric matrices, derivatives of graphene, and other functionalised nanoparticles are some of the materials that have been explored and investigated widely by researchers for their electrosensing/ biosensing properties and applications [82][83][84]. The following recent researches further ascertain the efficiency and remarkable role of NPs in biosensors: a. Shen et al [85] showed that the DNA nanostructures can be used in a variety of biomedical applications such as biosensors and cancer therapy as these can interact with small biomolecules and cancer cells due to their specific engineering, unparalleled programmability, and innate biocompatibility and can also serve as nanocarriers for various therapeutic agents.…”