Meso- and macroporous coral-like Co3O4 for VOCs gas sensor

Synthesis of p-Co3O4/n-TiO2 Nanoparticles for Overall Water Splitting under Visible Light Irradiation

“…To improve the efficiency of the hydrogen production, researchers work hard on modifying the nanomaterials [3,4,5,6]. Moreover, doping rare metals on semiconductor nanomaterials, changing the morphology of the nanomaterials and synthesis of complex nanomaterials are hot means that can be employed to improve the photocatalytic activity [7,8,9,10,11,12,13,14,15,16,17,18]. Maeda studied the photocatalytic activity of Rutile TiO 2 doped by Ru, Rh, Ir, Pt or Au, with the results showing that the most water splitting amount of H 2 and O 2 for 4 h is 56.6 μmol and 26.5 μmol, respectively, when Pt doping amount is at 1 wt.…”

Facile synthesis of mesoporous hierarchical Co3O4–TiO2 p–n heterojunctions with greatly enhanced gas sensing performance

“…For instance, xylene is a harmful organic compound that not only irritates eyes, nose, skin and respiratory system, but also induces serious symptoms such as headaches, fatigue, dizziness, rapid heart rate and unconsciousness even at low concentration. 1,2 Toluene and xylene come from various materials including building materials, paints, aerosols, disinfectants, air fresheners and automotive parts. Metal oxide semiconductor based gas sensors have attracted considerable attention because of their high portability, simplicity of use and low cost, and have previously been used to realize real-time monitoring of toluene and xylene.…”

Flash synthesis of Al-doping macro-/nanoporous ZnO from self-sustained decomposition of Zn-based complex for superior gas-sensing application to n-butanol

“…Compared with Al-ZnO with different morphologies, the gas response of the macro-/nanoporous ZnO [14,15] is better than that of porous ZnO flakes (prepared by microwave hydrothermal method and one-step hydrothermal method) [32,33], later comes the Al-ZnO films (prepared by cosputtering on a glass substrate) [34] and nanoparticles. Liu.…”

“…As we all know, the electrical conductivity of sensors is related to the gas species, operating temperature and relative humidity [14,15,30]. First, the gas response of sensors was tested from 260 to 420 • C at a relative humidity of 30%.…”

“…As gas sensor material, zinc oxide and its composite materials show high gas response and excellent selectivity to the reducing gases, such as volatile organic compounds (VOCs) [10][11][12][13][14], toxic or flammable gases [15]. A majority of researches have reported that doping chemical elements such as Ni, Mn, Al, Bi, Cr and Pr in hexagonal wuritzite ZnO can promote its selectivity and response to objective gases [16], change the crystalline state [13], and improve electrical conductivity [17].…”