A new self-propagated flaming (SPF) technique was applied to the synthesis of highly active layered CuO-δ-MnO hybrid composites, for the de-polluting catalytic total oxidation of gaseous toluene vapor. Other transition metal oxide-doped MnO hybrid composites were also successfully prepared and investigated, ensuring a feasible strategy for the fabrication of various layered MO-δ-MnO (M═Co, Ni, or Zn) hybrids. By changing the molar ratio of the precursors (KMnO and acetate salt) and the type of transition metal oxide introduced, it is possible to control the crystal structure and reducibility of the sheetlike hybrid composites as well as the catalytic activity for the total oxidation of toluene. The catalyst sample (CuO-δ-MnO) with a Mn/Cu molar ratio of 10:1 exhibited the highest catalytic performance, with a lower reaction temperature of 300 °C for complete toluene removal, which was comparable to the reaction temperature for total toluene conversion by the Pt-based catalyst. The SPF technique provides an approach for developing highly efficient catalysts for the complete removal of volatile organic compounds, by allowing the facile and energy-saving fabrication of large quantities of layered CuO-δ-MnO hybrids.
Van
der Waals (vdW) heterostructures are the fundamental blocks for two-dimensional
(2D) electronic and optoelectronic devices. In this work, a high-quality
2D metal–semiconductor NiTe2/MoS2 heterostructure
is prepared by a two-step chemical vapor deposition (CVD) growth.
The back-gated field-effect transistors (FETs) and photodetectors
based on the heterostructure show enhanced electronic and optoelectronic
performance than that of a pristine MoS2 monolayer, owing
to the better heterointerface in the former device. Especially, this
photodetector based on the metal–semiconductor heterostructure
shows 3 orders faster rise time and decay time than that of the pristine
MoS2 under the same fabrication procedure. The enhancement
of electronic behavior and optoelectronic response by the epitaxial
growth of metallic vdW layered materials can provide a new method
to improve the performance of optoelectronic devices.
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