Jihao Li

Ultra-light, compressible and fire-resistant graphene aerogel as a highly efficient and recyclable absorbent for organic liquids

Compressive graphene aerogels were obtained by the one-step reduction and self-assembly of graphene oxide with ethylenediamine and then freeze-drying. The aerogels hold good compressibility, variable electrical resistance and fire-resistance. The high porosity with a hydrophobic nature, allows the aerogels to absorb different organic liquids, and the absorption–squeezing process has been demonstrated for oil collection.

Flexible graphene fibers prepared by chemical reduction-induced self-assembly

Flexible graphene fibers (GFs) with an ultimate elongation of 20% and a tensile strength up to 150 MPa were prepared by a facile low temperature chemical reduction-induced self-assembly method using graphene oxide (GO) suspensions reacted with vitamin C and then dried at room temperature.

A facile method for preparing 3D graphene/Ag aerogel via gamma-ray irradiation

ABSTRACT In this article, we report a simple method to fabricate graphene and Ag nanoparticles (NPs) composite aerogel (GA/Ag). The GO and Ag ions were in situ reduced by gamma-ray irradiation and went through self-assembly three-dimensional (3D) honeycomb-like porous composite aerogel in the presence of isopropanol. Measurements using XRD, XPS, SEM, TEM revealed that the GO and Ag ions can efficiently reduction into rGO and Ag NPs. In addition, Ag NPs were homogeneously attached to the graphene nanosheets of the honeycomb-like porous structure and had a typical diameter of 30–70 nm. Thus the gamma-ray irradiation-induced synthesis is an efficient method for preparing 3D GA/Ag composite.

Preparation of flexible graphene@SnO2 composite fiber via in situ chemical reduction and self-assembly method

ABSTRACT A facile in-situ chemical reduction and self-assembly method was developed to prepare graphene and tin oxide (graphene@SnO2) composite fibers. The obtained graphene@SnO2 fiber exhibits excellent tensile mechanical performance with high mechanical strength and superior plastic deformation (mechanical strength up to 65 MPa with an ultimate elongation about 7%). The electrical resistance of the graphene@SnO2 fiber holds steady and has a negligible change in either the bent or straight status over 100 cycles. In the prepared composite fibers, SnO2 nanoparticles with sizes of 3–5 nm homogeneously dispersed on the graphene sheets. The conductivity of GF@SnO2 was about 6.0–2.5 S/cm with the increase content of Sn4+ due to the tin oxide semiconductor doping.