Catkin-derived mesoporous carbon-supported molybdenum disulfide and nickelhydroxyloxide hybrid as a bifunctional electrocatalyst for driving overall water splitting.

In this work, a two-dimensional heterostructure of molybdenum disulfide (MoS) and nickelhydroxyloxide (NiOOH) nanosheets supported on catkin-derived mesoporous carbon (C-MC) was constructed and exploited as an efficient electrocatalyst for overall water splitting. The C-MC nanostructure was prepared by pyrolyzing biomass material of catkin at 600 °C in N atmosphere. The C-MC network exhibited hollow nanotube structure and had a large specific surface area, comprising trace nitrogen and a large amount of oxygen vacancies.

Nonenzymatic amperometric sensor for hydrogen peroxide released from living cancer cells based on hierarchical NiCoO-CoNiO hybrids embedded in partially reduced graphene oxide.

The synthesis of hierarchical NiCoO-CoNiO hybrids embedded in partially reduced graphene oxide (represented by NiCoO/CoNiO@pPRGO) is described. They were derived from ultrathin CoNi-based zeolitic imidazolate framework (CoNi-ZIF) nanosheets vertically grew on three-dimensional (3D) pRGO networks by pyrolysis at different temperatures (300, 600, and 900 °C) in N atmosphere. Transmission electron microscopy, X-ray diffraction, and X-ray photoemission spectroscopy measurements showed that the metal coordination centers (Co or Ni) were transferred into NiCoO spinel and CoNiO nanostructures, along with a small number of metallic states of Co and Ni.

Three-dimensional nitrogen-doped mesoporous carbon nanomaterials derived from plant biomass: Cost-effective construction of label-free electrochemical aptasensor for sensitively detecting alpha-fetoprotein.

We synthesized three kinds of nitrogen-doped nanoporous carbon nanomaterials (represented by N-mC) through a cost-effective method, that is, pyrolysis of plant biomasses (grass, flower, and peanut shells). We further explored their potential as sensitive bioplatforms for electrochemical label-free aptasensors to facilitate the early detection of alpha-fetoprotein (AFP). Chemical structure characterizations revealed that rich functional groups coexisted in as-synthesized N-mC nanomaterials, such as C-C, C-O, C=O, C-N, and COOH.

NiCoO spinel embedded with carbon nanotubes derived from bimetallic NiCo metal-organic framework for the ultrasensitive detection of human immune deficiency virus-1 gene.

A bimetallic NiCo-based metal-organic framework (NiCo-MOF) was pyrolyzed into a novel composite comprising NiCoO spinel, CoO, and metallic Co/Ni nanoparticles embedded with carbon nanotubes at high temperature 700 °C under N atmosphere (represented by NiCoO/CoO@CNTs), whereas organic ligands were almost decomposed in H atmosphere, leading to absence of carbon nanotubes (denoted by NiCoO/CoO). The feasibility of using the composite as efficient bioplatform for immobilizing the probe DNA of human immune deficiency virus-1 (HIV-1) in the electrochemical detection of the HIV-1 DNA was explored. Compared with the pristine NiCo-MOF and NiCoO/CoO, the NiCoO/CoO@CNTs composite exhibited high electrochemical activity, good biocompatibility, and strong bioaffinity toward the probe DNA.

Electrochemical sensor based on a three dimensional nanostructured MoS nanosphere-PANI/reduced graphene oxide composite for simultaneous detection of ascorbic acid, dopamine, and uric acid.

A three dimensional (3D) nanostructured composite based on the self-assembly of MoS nanospheres and polyaniline (PANI) loaded on reduced graphene oxide (denoted by 3D MoS-PANI/rGO) was prepared a feasible one-pot hydrothermal process. The 3D MoS-PANI/rGO nanocomposite not only exhibits good functionality and bioaffinity but also displays high electrochemical catalytic activity. As such, the developed 3D MoS-PANI/rGO nanocomposite can be employed as the sensing platform for simultaneously detecting small biomolecules, , ascorbic acid (AA), dopamine (DA), and uric acid (UA).

Construction of Ce-MOF@COF hybrid nanostructure: Label-free aptasensor for the ultrasensitive detection of oxytetracycline residues in aqueous solution environments.

Porous organic framework (COF) nanomaterials have drawn increasing attention and showed promising potential in the applications of various fields. Nevertheless, its applications in biosensing or biomedical fields are still in the early stage. In this work, we designed and synthesized a series of nanohybrids of COF and Ce-based metal organic framework (Ce-MOF) for the first time as label-free bioplatforms for a sensitive electrochemical aptasensor to detect oxytetracycline (OTC).