Graphene, a one-atom layer of graphite, possesses unique two-dimensional (2D) structure, high conductivity and charge carrier mobility, huge specific surface area, transparency great mechanical strength. Thus, it is expected to be an ideal material for energy storage conversion. During the past several years, variety graphene based materials (GBMs) have been successfully prepared applied in supercapacitors, lithium ion batteries, water splitting, electrocatalysts fuel cells, solar cells. In...

Graphene and its functionalized derivatives are unique versatile building blocks for self-assembly to fabricate graphene-based functional materials with hierarchical microstructures. Here we report a strategy three-dimensional of graphene oxide sheets DNA form multifunctional hydrogels. The hydrogels possess high mechanical strength, environmental stability, dye-loading capacity, exhibit self-healing property. This study provides new insight the assembly other blocks, especially...

The recent boom in multifunction portable electronic equipments requires the development of compact and miniaturized circuits with high efficiencies, low costs long lasting time. For operation most line-powered electronics, alternating current (ac) line-filters are used to attenuate leftover ac ripples on direct (dc) voltage busses. Today, aluminum electrolytic capacitors (AECs) widely applied for this purpose. However, they usually largest components circuits. Replacing AECs by more will...

ZnO1-x/graphene hybrid photocatalyst was prepared via a facile in-situ reduction of graphene oxide and ZnO1-x surface defect oxide. The photocatlayst showed enhanced photocatalytic activity for the photodegradation methylene blue. photocorrosion successfully inhibited by hybridation. with 1.2 wt % optimized activity. ZnO1-x/graphene-1.2 under visible UV light about 4.6 times that sample, respectively. photocurrent intensity irradiation can be 2 3.5 hybridization. enhancement in attributed to...

To achieve efficient conversion of renewable energy sources through water splitting, low-cost, earth-abundant, and robust electrocatalysts for the oxygen evolution reaction (OER) hydrogen (HER) are required. Herein, vertically aligned oxygenated-CoS2–MoS2 (O-CoMoS) heteronanosheets grown on flexible carbon fiber cloth as bifunctional have been produced by use Anderson-type (NH4)4[CoIIMo6O24H6]·6H2O polyoxometalate bimetal precursor. In comparison to different O-FeMoS, O-NiMoS, MoS2 nanosheet...

Graphitic carbon nitride, a polymeric catalyst, was immobilized on the surfaces of chemically converted graphene sheets to form layered composite, which exhibited greatly improved conductivity and electrocatalytic performance oxygen reduction reaction.

We report an improved Hummers method for synthesizing graphene quantum dots (GQDs) by directly oxidizing and etching graphite powders. The yield of GQDs is as high 63 ± 7% (by weight, wt%), suggesting this technique suitable producing on a large scale. are nanocrystals with lateral dimensions in the range 2-4 nm average thickness around 1.3 nm. emission peaks as-prepared can be tuned 440 to 510 varying reaction conditions. Their fluorescence yields were tested 1%, which could further...

Abstract Developing earth‐abundant, active, and robust electrocatalysts for oxygen evolution reaction (OER) hydrogen (HER) remains a vital challenge efficient conversion of sustainable energy sources. Herein, metal–semiconductor hybrids are reported with metallic nanoalloys on various defective oxide nanowire arrays (Cu/CuO x , Co/CoO CuCo/CuCoO ) as typical Mott–Schottky electrocatalysts. To build the highway continuous electron transport between metals semiconductors, nitrogen‐doped carbon...

Inorganic perovskite quantum dots as optoelectronic materials have attracted enormous attention in light-harvesting and emitting devices. However, photocatalytic conversion based on inorganic halides has not been reported. Here, we synthesized colloidal (QDs, 3-12 nm) of cesium lead halide perovskites (CsPbBr3 ) a new type material. The band gap energies photoluminescence (PL) spectra are tunable over the visible spectral region according to size effects an atomic scale. increased carrier...

Abstract Graphene has wide potential applications in energy‐related systems, mainly because of its unique atom‐thick two‐dimensional structure, high electrical or thermal conductivity, optical transparency, great mechanical strength, inherent flexibility, and huge specific surface area. For this purpose, graphene materials are frequently blended with polymers to form composites, especially when fabricating flexible devices. Graphene/polymer composites have been explored as electrodes...

Sensitivity, selectivity, visible detection, and rapid response are the main concerns for an analytical method. Herein, we reported a metal-organic framework (MOF)-based ratiometric fluorescence detection strategy hypochlorous acid (HClO). The MOF was prepared with dual ligands, 2-aminoterephthalic (BDC-NH2) dipicolinic (DPA) Eu3+ ions as metal node, denoted Eu-BDC-NH2/DPA. dual-ligand realized emission sensing visual adjusted size morphology of MOFs to obtain good dispersion response,...

Bacterial contamination accounts for more than half of food poisoning cases. Conventional methods such as colony-counting and general polymerase chain reaction are time-consuming, instrument-dependent, sometimes not accurate. Herein, we developed a novel one-pot toolbox with precision ultra sensitivity (OCTOPUS) platform foodborne pathogen detection based on the mechanism in which Cas12a nontarget binding unleashes its collateral DNase activity. We demonstrated application two widespread...

Abstract Here an excellent trimodality imaging‐guided synergistic photothermal therapy (PTT)/photodynamic (PDT)/chemodynamic (CDT) is proposed. To this end, a mixed‐metal Cu/Zn‐metal‐organic framework (MOF) first assembled at room temperature on nano‐scale. Interestingly, heating the MOF results in Cu +/2+ ‐coexisting hollow porous structure. Subsequent treatment used to integrate Mn 2+ and MnO 2 presence of manganese(II) acetylacetonate. The composite achieves efficient loading...

Abstract Cascade catalytic reaction exhibits simple procedure and high efficiency, such as that from the orderly assembly of different enzymes in biological systems. Mimicking natural cascade becomes critical, but is still challenging. Herein, single Au–Pt nanozyme reported with “three‐in‐one” functions to initiate conversions for O 2 supply mimic catalase, H production its glucose oxidase‐like property, • OH generation peroxidase chemodynamic therapy (CDT). Thus, complex cross‐talk among...

2-Aminoanthraquinone (AAQ) molecules were covalently grafted onto chemically modified graphene (CMG), and the AAQ functionalized CMG sheets self-assembled into macroporous hydrogels for supercapacitor electrodes. The electrode based on hydrogel (AQSGH) showed a high specific capacitance of 258 F g(-1) at discharge current density 0.3 A g(-1), which is much larger than that pure (193 g(-1)). Furthermore, AQSGH exhibited excellent rate capability long cycle life. This mainly due to bonded...

Nanoporous nitrogen doped carbon was used to modify the surfaces of graphene sheets by carbonizing a mixture oxide and phenol–melamine–formaldehyde (PMF) pre-polymer in presence soft template (F127). The resulting based composite (G-PMFs) have sandwich structure with one layer two nanoporous nitrogen-doped layers. G-PMFs large specific surface areas 190 630 m2 g−1 exhibited high electrocatalytic activity, good durability selectivity for oxygen reduction reaction. performance Zn–air fuel cell...

Abstract Atomically thin 2D heterostructures have opened new realms in electronic and optoelectronic devices. Herein, lateral of mesoporous In 2 O 3– x /In S 3 atomic layers are synthesized through the situ oxidation by an oxygen plasma‐induced strategy. Based on experimental observations theoretical calculations, prolonged charge carrier lifetime increased electron density reveal efficient photoexcited transport separation interfacial bonding at level. As expected, synergistic structural...

Self-assembled graphene organogel (SGO) with 3-dimensional (3D) macrostructure was prepared by solvothermal reduction of a oxide (GO) dispersion in propylene carbonate (PC). This SGO used as an electrode material for fabricating supercapacitors PC electrolyte. The supercapacitor can be operated wide voltage range 0–3 V and exhibits high specific capacitance 140 F g−1 at discharge current density 1 A g−1. Furthermore, it still keep 90 30 maximum energy the based tested to 43.5 Wh kg−1, this...

Abstract The development of active bifunctional electrocatalysts with low cost and earth‐abundance toward oxygen evolution reaction (OER) hydrogen (HER) remains a great challenge for overall water splitting. Herein, metallic Ni 4 Mo nanoalloys are firstly implanted on the surface NiMoO x nanowires array (NiMo/NiMoO ) as metal/metal oxides hybrid. Inspired by superiority carbon conductivity, an ultrathin nitrogen‐doped sheath intercalated NiMo/NiMoO (NC/NiMo/NiMoO integrated core–shell...

Abstract Probing robust electrocatalysts for overall water splitting is vital in energy conversion. However, the catalytic efficiency of reported catalysts still limited by few active sites, low conductivity, and/or discrete electron transport. Herein, bimetallic nickel–copper (NiCu) nanoalloys confined mesoporous nitride (NiCuN) nanowires array encapsulated nitrogen‐doped carbon (NC) framework (NC–NiCu–NiCuN) constructed carbonization‐/nitridation‐induced situ growth strategies. The...

Herein, we revealed the factors that affect emission in mixed-ligand metal-organic frameworks (MOFs) with combination of terephthalic acid (BDC), 2-aminoterephthalic (BDC-NH2), and 2,5-dihydroxylterephthalic [BDC-(OH)2] as models. The -NH2 -(OH)2 groups change π-conjugation luminescence behaviors than BDC, so ligands show different optical behaviors. Zn2+ ion a 3d10 full electronic structure shows little effect on ligand is selected metal node. We found BDC weak incompatible to BDC-NH2, only...

The Cas13a system has great potential in RNA interference and molecular diagnostic fields. However, lacking guidelines for crRNA design hinders practical applications of the editing single nucleotide polymorphism identification. This study posits that crRNAs with hairpin spacers improve specificity CRISPR/Cas13a (termed hs-CRISPR). Gibbs free energy analysis suggests hairpin-spacer (hs-crRNAs) suppress Cas13a's affinity to off-target RNA. A hepatitis B virus DNA genotyping platform is...