CO gas sensitivity and its oxidation over TiO2 modified by PANI under UV irradiation at room temperature

Wang, Zhongming; Peng, Xiaoying; Huang, Chung-Yuan; Chen, Xun; Dai, Wenxin; Fu, Xianzhi

doi:10.1016/j.apcatb.2017.07.080

Cited by 97 publications

(33 citation statements)

References 56 publications

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“…Wang et al prepared a series of polyaniline-TiO 2 nanocomposites on the TiO 2 surface by in-situ chemical oxidation polymerization of aniline (Wang et al, 2017). It was found that the polyaniline chain formed by TiO 2 and polyaniline could increase the CO adsorption, which led to much more electrons transfer from CO to polyaniline.…”

Section: Research Status Of Metal Oxides For Gas Sensorsmentioning

confidence: 99%

Gas-Sensing Performances of Metal Oxide Nanostructures for Detecting Dissolved Gases: A Mini Review

Guan

Tang²,

et al. 2020

Front. Chem.

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Gas sensors have been wildly used in various fields related to people's lives. Gas sensor materials were the core factors that affected the performances of various gas sensors, and these have attracted much attention from scientific researchers due their high sensitivity, high selectivity, adjustable reliability, low cost, and other advantages. The preparation of nanostructures with a highly specific surface area was a useful method to improve the gas-sensing performance of a metal oxide semiconductor. Meanwhile, lots of research has focused on preparing nanostructures with a highly specific surface area. This paper has explored some fabricated sensors with high sensitivity, good selectivity, and long-term stability, which has also made them promising candidates for toxic gas detection. Besides, this paper has reviewed the development status of metal oxides used as gas sensors.

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Section: Research Status Of Metal Oxides For Gas Sensorsmentioning

confidence: 99%

Gas-Sensing Performances of Metal Oxide Nanostructures for Detecting Dissolved Gases: A Mini Review

Guan

Tang²,

et al. 2020

Front. Chem.

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“…When irradiated with ultraviolet light (wavelength < 400nm and energy band = 3.2 eV), an electron in the valence band is excited and advances to the conduction band for the generation of a photo-generated electrons (e − ), leaving photo-generated holes (h + ) in the valence band ( Figure 1b). The obtained photo-generated holes (h + ) have an excellent ability to oxidize organic chemicals attached to the surface of TiO 2 or oxidize OH − to yield • OH radical in the first place, and subsequently oxidize the organics for small molecule compounds [40][41][42]. In this work, TiO 2 -supported nickel catalyst was introduced into the selective oxidation of β-O-4 ketone model compounds, resulting in the generation of value-added aromatics.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Photocatalytic Cleavage of β-O-4 Ether Bonds in Lignin over Ni/TiO2

et al. 2020

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It is of great importance to explore the selective hydrogenolysis of β-O-4 linkages, which account for 45–60% of all linkages in native lignin, to produce valued-added chemicals and fuels from biomass employing UV light as catalyst. TiO2 exhibited satisfactory catalytic performances in various photochemical reactions, due to its versatile advantages involving high catalytic activity, low cost and non-toxicity. In this work, 20 wt.% Ni/TiO2 and oxidant PCC (Pyridinium chlorochromate) were employed to promote the cleavage of β-O-4 alcohol to obtain high value chemicals under UV irradiation at room temperature. The Ni/TiO2 photocatalyst can be magnetically recovered and efficiently reused in the following four consecutive recycling tests in the cleavage of β-O-4 ether bond in lignin. Mechanism studies suggested that the oxidation of β-O-4 alcohol to β-O-4 ketone by oxidant PCC first occurred during the reaction, and was followed by the photocatalysis of the obtained β-O-4 ketone to corresponding acetophenone and phenol derivates. Furthermore, the system was tested on a variety of lignin model substrates containing β-O-4 linkage for the generation of fragmentation products in good to excellent results.

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“…During the last decades, although other types of sensor systems were introduced to the environmental community like micro-/nanoelectromechanical gravimetric gas and nanoparticle sensors [33][34][35][36][37][38][39][40][41][42], conductometric gas sensors were still in high demand and widely investigated due to several advantages, e.g., low cost and flexibility in production, the large number of detectable gases/possible application fields, simplicity in measurement setup, and the ease of miniaturization for portable instruments [43]. However, most of the available conductometric sensing devices are based on n-type materials (e.g., ZnO and SnO 2 ) with wide band gap which needs UV light to activate the absorption and desorption processes occurring in the surface of the sensing material [44][45][46][47][48]. The energy and efficiency of UV LEDs are far from being competitive compared to those of visible LEDs.…”

Section: Introductionmentioning

confidence: 99%

Visible Light-Driven p-Type Semiconductor Gas Sensors Based on CaFe2O4 Nanoparticles

Qomaruddin

Casals

Šutka

et al. 2020

Sensors

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In this work, we present conductometric gas sensors based on p-type calcium iron oxide (CaFe2O4) nanoparticles. CaFe2O4 is a metal oxide (MOx) with a bandgap around 1.9 eV making it a suitable candidate for visible light-activated gas sensors. Our gas sensors were tested under a reducing gas (i.e., ethanol) by illuminating them with different light-emitting diode (LED) wavelengths (i.e., 465–640 nm). Regardless of their inferior response compared to the thermally activated counterparts, the developed sensors have shown their ability to detect ethanol down to 100 ppm in a reversible way and solely with the energy provided by an LED. The highest response was reached using a blue LED (465 nm) activation. Despite some responses found even in dark conditions, it was demonstrated that upon illumination the recovery after the ethanol exposure was improved, showing that the energy provided by the LEDs is sufficient to activate the desorption process between the ethanol and the CaFe2O4 surface.

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CO gas sensitivity and its oxidation over TiO2 modified by PANI under UV irradiation at room temperature

Cited by 97 publications

References 56 publications

Gas-Sensing Performances of Metal Oxide Nanostructures for Detecting Dissolved Gases: A Mini Review

Gas-Sensing Performances of Metal Oxide Nanostructures for Detecting Dissolved Gases: A Mini Review

Photocatalytic Cleavage of β-O-4 Ether Bonds in Lignin over Ni/TiO2

Visible Light-Driven p-Type Semiconductor Gas Sensors Based on CaFe2O4 Nanoparticles

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