Ultra-sensitive and fast response formaldehyde sensor based on La2O3-In2O3 beaded nanotubes at low temperature

Zeng, Xiangan; Liu, Li; Lv, Yifeng; Zhao, Bing; Ju, Xiangnan; Xu, Suyan; Zhang, Jianxia; Tian, Chunxia; Sun, Dongbai; Tang, Xuning

doi:10.1016/j.cplett.2020.137289

Cited by 24 publications

(13 citation statements)

References 32 publications

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“…In accordance with the theory of absolute electronegativity [54][55][56], the E CB and E VB of CN were calculated to be −1.22 eV and 1.68 eV and those of LaO were found to be −4.83 eV and 0.45 eV. As previously substantiated in prior research, LaO and CN belong to p-type and n-type semiconductors, respectively [57,58]. In general, the Fermi levels of p-type and n-type semiconductors are located close to the VB and CB, respectively.…”

Section: Photocatalytic Reaction Mechanismsupporting

confidence: 87%

Fabrication of La2O3/g-C3N4 Heterojunction with Enhanced Photocatalytic Performance of Tetracycline Hydrochloride

Zhu

Xia

et al. 2021

Crystals

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In this study, La2O3/g-C3N4 heterojunction photocatalysts doped with different dosages of La2O3 were constructed by a facile ultrasound-assisted calcination approach. The as-prepared photocatalysts were characterized by XRD, FTIR, FESEM, TEM, XPS, PL and DRS to verify the composite photocatalysts’ purity and to investigate their structural, morphological and elemental composition, and their energy band. According to the results, a type of pure rod–sheet-shaped, heterostructured nanoparticle was successfully obtained. Decorated with 10% La2O3, 2 g/L of the composite sample had a 93% degradation rate for 20 mg/L tetracycline hydrochloride within 2 h under visible light at a pH of 7. After four successive photocatalytic runs, satisfactory stability and reusability was exhibited, with 70% of the tetracycline hydrochloride being removed in the final experiment. Electrons (e−), photogenerated holes (h+), superoxide radical anions (·O2−) and hydroxyl radicals (·OH) were the fundamental active species during the photocatalytic process and were investigated via quenching experiments. Furthermore, possible photocatalytic mechanisms were analyzed in this work.

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Section: Photocatalytic Reaction Mechanismsupporting

confidence: 87%

Fabrication of La2O3/g-C3N4 Heterojunction with Enhanced Photocatalytic Performance of Tetracycline Hydrochloride

Zhu

Xia

et al. 2021

Crystals

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“…It was found by photoluminescence that the concentration of oxygen vacancies also decreases as a result of the compression of the lattice of SnO 2 nanocrystals when doped with Ti 4+ ions (radius 0.64 Å) [38]. At the same time, decrease in E MO as a result of lattice expansion upon the replacement of 5% In ions 3+ by larger La ions 3+ (radius 1.03 Å) in La 2 O 3 -In 2 O 3 composites [39,40] is accompanied by an increase in the concentration of oxygen vacancies [41] and an increase in the conductivity of the composite [42].…”

Section: Isovalent Dopingmentioning

confidence: 99%

“…According to X-ray photoelectron spectroscopy (XPS) data, when doping ions such as Al 3+ and La 3+ into In 2 O 3 nanocrystals, the content of the chemisorbed oxygen on the surface of these nanocrystals increases [36,39,40,42]. This indicates an increase in the number of oxygen chemisorption centers, which are surface oxygen vacancies.…”

Section: Isovalent Dopingmentioning

confidence: 99%

“…The increase in the content of chemisorbed oxygen on the surface of In 2 O 3 nanocrystals caused by their isovalent doping with Al 3+ and La 3+ ions, leads to an increase in the sensory effect in the detection of various reducing gases, especially hydrogen sulfide and oxygen-containing organic compounds (formaldehyde, ethanol, acetone, etc.) [36,39,40,42]. The increased sensory effect during the detection of compounds of this nature also occurs as a result of isovalent doping of SnO 2 with Ti 4+ [44,45].…”

Section: Isovalent Dopingmentioning

confidence: 99%

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Effect of Composition and Structure of Metal Oxide Composites Nanostructured on Their Conductive and Sensory Properties

Герасимов

Громов

Иким

et al. 2021

Russ. J. Phys. Chem. B

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The relationship between the structure and properties of nanoscale conductometric sensors based on binary mixtures of metal oxides in the detection of reducing gases in the environment is considered. The sensory effect in such systems is determined by the chemisorption of oxygen molecules and the detected gas on the surface of metal oxide catalytically active particles, the transfer of the reaction products to electron-rich nanoparticles, and subsequent reactions. Particular attention is paid to the doping of nanoparticles of the sensitive layer. In particular, the effect of doping on the concentration of oxygen vacancies, the activity of oxygen centers, and the adsorption properties of nanoparticles is discussed. In addition, the role of heterogeneous contacts is analyzed.

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“…Zeng et al prepared a La 2 O 3 -In 2 O 3 and nanotube sensor using an electrospinning method, and the sensor has a response value of 101.9 to 50 ppm formaldehyde gas. They reported that when the RH value was lower than 60%, the sensor's response to formaldehyde gas was relatively stable, but when the RH value was higher than 60%, the sensor's response to formaldehyde gas was decreased sharply with the increase of RH values [14].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Metal Organic Framework Enhanced Acoustic Wave Formaldehyde Sensor Based on Polyethyleneimine and Bacterial Cellulose Nanofilms

Wang¹,

Shang²,

Guo³

et al. 2021

Preprint

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A surface acoustic wave (SAW) formaldehyde gas sensor was fabricated on a 42°75' ST-cut quartz substrate, with a composite sensing layer of zeolitic imidazolate framework (ZIF)-8 on polyethyleneimine (PEI)/ bacterial cellulose (BC) nanofilms. The addition of snowflake-like ZIF-8 structure on the PEI/BC sensitive film significantly improves the hydrophobicity of the SAW sensor and increases the sensor's sensitivity to formaldehyde gas. It also significantly increases the surface roughness of the sensitive film. Its hydrophobic nature prevents water molecules from entering into the internal pores of the BC film, thereby avoiding significant mass loading caused by the humidity change when the sensor is used to detect low-concentration formaldehyde gas. The Zn2+ sites at the surface of ZIF-8 improves the sensor's response to formaldehyde gas through enhancing the physical adsorptions. Experimental results show that the ZIF-8@PEI/BC SAW sensor has a response (e.g., frequency shift) of 40.3 kHz to 10 ppm formaldehyde gas at 25℃ and 30% RH. When the relative humidity was increased from 30% to 93%, the response (frequency shift) of the sensor drifts only ~5%, and there is negligible drift at a medium humidity level (~56% RH).

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Ultra-sensitive and fast response formaldehyde sensor based on La2O3-In2O3 beaded nanotubes at low temperature

Cited by 24 publications

References 32 publications

Fabrication of La2O3/g-C3N4 Heterojunction with Enhanced Photocatalytic Performance of Tetracycline Hydrochloride

Fabrication of La2O3/g-C3N4 Heterojunction with Enhanced Photocatalytic Performance of Tetracycline Hydrochloride

Effect of Composition and Structure of Metal Oxide Composites Nanostructured on Their Conductive and Sensory Properties

Hydrophobic Metal Organic Framework Enhanced Acoustic Wave Formaldehyde Sensor Based on Polyethyleneimine and Bacterial Cellulose Nanofilms

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