Electrochemical fabrication of stalactite-like copper micropillar arrays via surface rebuilding for ultrasensitive nonenzymatic sensing of glucose

Rapid fabrication of SERS substrate and superhydrophobic surface with different micro/nano-structures by electrochemical shaping of smooth Cu surface

“…S1a (Supplementary data), which is consistent with previous reports [27,29,30]. During positive potential scanning, oxidation current initiated at −0.4 V for dissolution of Cu with an oxidation current peak around 0.1 V, which is related to two-step single electron transfer reactions producing Cu 2 O, CuO, CuSO 4 , and free Cu 2+ ions [27,29,30]. The oxidation current dropped rapidly over 0.1 V and the copper surface became passive at 0.4 V due to the accumulation and coverage of copper oxides and hydrated sulfates.…”

“…1. When the applied pulse potential remains at 0 V, copper oxides of Cu 2 O and CuO, CuSO 4 and Cu 2+ form [27,29,30]. As the potential switches to −1.4 V, these copper species of Cu(I) and Cu(II) are reduced into copper atoms.…”

“…Qiu et al has also obtained three-dimensional porous copper film by SWPP in NaOH solution [26]. Recently, we have fabricated stalactite-like copper micropillar arrays via SWPP in H 2 SO 4 solution for ultrasensitive nonenzymatic sensing of glucose [27]. However, these preparation processes consumed thousands of seconds.…”

Molecular imprinting method for fabricating novel glucose sensor: Polyvinyl acetate electrode reinforced by MnO2/CuO loaded on graphene oxide nanoparticles

“…As a result, considerable attention has been paid to develop the methods based on enzyme-free electrodes (Hu et al, 2014;Ruiyi et al, 2015). Electrodes, modified with metal nanoparticles, metal alloys and metal oxides, have been examined as enzyme-free electrochemical glucose sensors (Cooray et al, 2015;Li et al, 2015). However, most of these sensors have displayed the drawbacks of the high cost of rare metal precursors and low sensitivity.…”

Electrochemical determination of 4-nitrophenol using uniform nanoparticle film electrode of glass carbon fabricated facilely by square wave potential pulses

“…In this work, the GC-UNFE was formed directly by treating smooth GC surface in a blank solution of NaOH with square wave potential pulses (SWPPs). Previously, the method similar to SWPP has been employed to prepare some nanostructured films such as three-dimensional porous gold film and copper micropillar arrays [35][36]. The preparation conditions of GC-UNFE including potential, time and frequency of SWPPs were examined here using 4-NP as the model molecules.…”