Have you seen the film? Coupling a spray‐coating technique with a facile, low‐cost, efficient and environmentally friendly electrochemical method may realize the controllable synthesis of large‐area and patterned electrochemically reduced graphene oxide films on various conductive and insulating substrates with thicknesses ranging from a single monolayer to several microns (see figure).

We demonstrated a facile and green approach to synthesize bifunctional fluorescent carbon nanodots via soy milk, which not only showed favorable photoluminescent properties, but also exhibited good electrocatalytic activity towards oxygen reduction reaction.

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In this communication, we report on our recent finding that photoluminescent carbon nitride dots (CNDs) can be prepared by a simple heat-treatment-based strategy for the first time. It suggests the CNDs thus obtained exhibit strong fluorescence. The formation of such CNDs can be attributed to the polymerization of CCl 4 and 1,2ethylenediamine under reflux, microwave, or solvothermal heating.

Developing highly-efficient and low-cost noble metal-free catalysts toward hydrogen evolution from water splitting is an attractively alternative strategy to solve the ever-increasing environmental contamination and energy demand. Herein, the porous CoP electrocatalyst with a concave polyhedron (CPH) structure was facilely prepared by a topological conversion strategy using Co-MOFs (ZIF-67) polyhedrons as the precursor. The morphology of Co-MOFs is well inherited by the asprepared CoP sample due to the multi-step calcination process at low temperature, which imaginably results in the formation of a porous structure. Compared with the contrastive CoP nanoparticles (NPs), the obtained porous CoP CPHs electrocatalyst exhibit a remarkably enhanced electrocatalytic performance with a current density of 10 mA cm -2 at an overpotential of 133 mV and a superior durability for hydrogen evolution reaction (HER) in acid media. A small Tafel slope of ca. 51 mV dec -1 reveals a Volmer-Heyrovsky mechanism during the HER. This work provided a new insight to fabricate morphology-controlled transition metal phosphides with a porous structure via topological conversion, which have important potential applications, such as electrocatalysis, photocatalysis and sensor, thanks to its porosity and controllability.The EDX results in Table S2 indicate the atom ratios of Co and P before and after electrocatalysis are both ca. 1 : 1. Overall, the as-prepared CoP CPHs have good structural stability and electrocatalytic durability.

In this Letter, we demonstrate the first use of carbon nanoparticles (CNPs) obtained from carbon soot by lighting a candle as a cheap, effective fluorescent sensing platform for Ag(+) detection with a detection limit as low as 500 pM and high selectivity. We further demonstrate its practical application to detect Ag(+) in a real sample.

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In this work, we report a nanoscale multichannel closed bipolar electrode (BPE) array based on the poly(ethylene terephthalate) (PET) membrane for the first time. With our design, oxidants, coreactants, quenchers, and even biomarkers can be detected in a Ru(bpy)3(2+)/TPA (tripropylamine) electrochemiluminescence (ECL) system. The multichannel PET membrane was etched according to our desire by NaOH, and then Au nanofibers were decorated in the inner region of the channel as a BPE array. Using ECL as a signal readout, a series of targets including TPA, Ru(bpy)3(2+), dopamine, H2O2, alpha-fetoprotein (AFP), and carcino-embryonic antigen (CEA) can be detected with this device. The practical application of the proposed multichannel closed BPE array was verified in the detection of AFP and CEA in human serum with satisfying results. This kind of nanoscale device holds promising potential for multianalysis. More importantly, as the PET membrane used in this device can be etched with a desirable diameter (nano- to microscale) and different BPE array densities (ion tracks of 10(8)/cm(2), 10(6)/cm(2), 10(4)/cm(2)), our design can be served as a useful platform for future advances in nanoscale bipolar electrochemistry.