Electrochemical deposition of gold nanoparticles on reduced graphene oxide modified glassy carbon electrode for simultaneous determination of levodopa, uric acid and folic acid

Theoretical and experimental studies of the influence of gold ions and DMH on cyanide-free gold electrodeposition

“…Gold deposits are widely used for decorative and functional applications owing to their beautiful appearance and superior physicochemical properties. [1][2][3][4][5][6][7] The traditional electrolytes employed for gold plating contain the cyanide-based complex [Au(CN) 2 ] À (ref. 8 and 9) as the source of gold, which releases free cyanide ions during the plating process.…”

Au-IDA microelectrodes modified with Au-doped graphene oxide for the simultaneous determination of uric acid and ascorbic acid in urine samples

“…Such combined properties enhance fast electron transfer, enabling its application in electrochemical sensing and biosensing. In order to increase its sensitivity and selectivity, GO usually is functionalised with other materials, such as nanoparticles or polymers [16][17][18][19][20][21]. At present, several of the recent studies have combined gold nanoparticles with graphene-based materials for electrochemical sensors and biosensors, trying to take advantage of the catalytic character and biocompatibility of gold.…”

“…The proposed sensor exhibited a linear response range for AA between 75 µM and 2275 µM, and for UA between 3.6 µM and 249.6 µM. Several works have been reported for the electroanalytical determination of UA and AA in the presence of other compounds and most of them used a glassy carbon electrode as support of the modified-GO [17,18,20]. Benvidi et al fabricated a reduced graphene oxide (RGO), gold nanoparticles and 2-(3,4-dihydroxyphenyl)benzothiazole-modified glassy carbon electrode for the simultaneous determination of levodopa, uric acid and folic acid [17].…”

“…Several works have been reported for the electroanalytical determination of UA and AA in the presence of other compounds and most of them used a glassy carbon electrode as support of the modified-GO [17,18,20]. Benvidi et al fabricated a reduced graphene oxide (RGO), gold nanoparticles and 2-(3,4-dihydroxyphenyl)benzothiazole-modified glassy carbon electrode for the simultaneous determination of levodopa, uric acid and folic acid [17]. Only a few publications may be found related with modified interdigitated arrays [21,25] or screen-printed electrodes [19], with a small size which makes the development of portable Lab-on-a-Chip devices feasible.…”

Electrochemical Determination of Chromium(VI) in River Water with Gold Nanoparticles-Graphene Nanocomposites Modified Electrodes

“…[10][11][12][13][14][15][16][17] The graphene-based nanomaterials is also being used for electrochemical sensing applications with greater frequency because of unique properties, such as high conductivity, excellent mechanical property and large active surface area. [18][19][20][21][22][23] A modified electrode with AuNPs and graphene nanocomposites for the detection of Cr(VI) was first reported by Santhosh and coworkers. limit was not provided.…”