Highly sensitive and selective room-temperature formaldehyde sensors using hollow TiO2 microspheres

Li, Xiaogan; Li, Xiaoxin; Wang, Jing; Lin, Shiwei

doi:10.1016/j.snb.2015.05.031

Cited by 124 publications

(61 citation statements)

References 39 publications

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“…The reason for the induced change of the electrical resistance of the metal oxide based sensors when exposed to the targeted gases is attributed to the redox reactions between these adsorbed ionized oxygen and the targeted gases during which the trapped electrons by oxygen were released back to the sensing materials (Wu et al, 2012;Liu et al, 2013;Li et al, 2015;Chen et al, 2016). However, this sensing reaction process needs higher energy to be triggered at low temperatures.…”

Section: Sensing Mechanismmentioning

confidence: 99%

“…Recently, an alternative method utilizing the light energy to activate the sensing process of the SMO based gas sensors have been reported extensively (Camagni et al, 1996;Fan et al, 2009;Prades et al, 2009;Lu et al, 2012;Wu et al, 2012;Liu et al, 2013;Park et al, 2013;Zhang et al, 2014;Li et al, 2015Li et al, , 2017Chen et al, 2016;Saboor et al, 2016;Gu et al, 2017a). Adopting the light with a wavelength at or close to the corresponding optical forbidden bandgap of the SMO, the sensing properties of SMO based sensors can be significantly enhanced at much lower operating temperature or even room temperature (Camagni et al, 1996;Fan et al, 2009;Prades et al, 2009;Lu et al, 2012;Wu et al, 2012;Liu et al, 2013;Park et al, 2013;Zhang et al, 2014;Li et al, 2015Li et al, , 2017Chen et al, 2016;Saboor et al, 2016;Gu et al, 2017a). The photogenerated electrons or holes can facilitate the chemical redox reactions between pre-adsorbed ionized oxygens and the targeted gas molecules thus inducing a sensor signal even at room temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang made TiO 2 nanoparticles based chemiresistive gas sensor with the light illumination and working in the condition of 60 o C (Zhang et al, 2014). However, by using the hollow structured TiO 2 nanotubes or microspheres, the selectivity and response speeds are improved significantly (Wu et al, 2012;Liu et al, 2013;Li et al, 2015;Chen et al, 2016). Chen et al (2016) made a hollow ZnO based gas sensor and found a very promising to be used for a selective ethanol sensor working at 80 • C with the UV activation.…”

Section: Introductionmentioning

confidence: 99%

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UV Light Activated SnO2/ZnO Nanofibers for Gas Sensing at Room Temperature

Yang

et al. 2019

Front. Mater.

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Hierarchical SnO 2 /ZnO nanofiber heterojunctions composed of SnO 2 nanofiber matrix on top of which ZnO nanorods protruding 30-90 nm long were assembled, were examined for chemiresistive-type gas sensors under UV activation at room temperature. The sensor demonstrated excellent sensitivity to different concentrations of formaldehyde and selectivity to several possible interferents such as alcohols, methanol, benzene, methylbenzene, and acetone with UV LED at a wavelength of 365 nm. The fiber-like heterojunctions can facilitate the electron transfer from ZnO to SnO 2 and this effect would be augmented further under UV light activation. Consequently it enhanced the oxygen adsorptions on the surface of the heterojunctions thus leading to the excellent sensing performance even at room temperature. The influence of the power density and wavelength of UV light used and ambient humidity on the sensor response was systematically investigated. Comparing to the conventional thermal activated one that instead showed preferred response to acetone at 375 • C, the enhanced sensitivity and selectivity of the same sensor at room temperature under LED UV light can be attributed to selective photo-catalytic effect induced by the UV light.

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Section: Sensing Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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UV Light Activated SnO2/ZnO Nanofibers for Gas Sensing at Room Temperature

Yang

et al. 2019

Front. Mater.

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“…TiO 2 can be obtained in many forms, such as sol-gels [12], nanoparticles [13], nanofibers [14], and nanotubes [15]. Thanks to their biocompatibility, stability, and environmental safety, titanium oxide has been applied in different manners such as solar energy conversion devices [16], photocatalysis [17], sensors [18], and photochromic devices [19]. In addition, because of their high ion exchange capacity, another promising aspect of this inorganic material is to act as an inorganic ion exchanger and sorbent, thus being useful for solid-phase extractions [20].…”

Section: Introductionmentioning

confidence: 99%

The use of titanium (IV) phosphate for metal removal from aqueous and alcoholic samples

et al. 2019

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Adsorption methods are widely employed for the removal of metals from aqueous medium, being an efficient and environmentally friendly technique for wastewater treatment. From the several adsorptive materials that are being employed by the specialized literature in removal processes, TiO 2 continues to be a wise choice. In this work, we have prepared a phosphate-modified TiO 2 (TiPh) and tested their adsorptive behavior toward different metallic species. TiPh synthesis was carried out from a titanium (IV) isopropoxide in aqueous phosphoric acid solution. The adsorption of Co +2 , Cu +2 , and Ni +2 in a TiPh matrix was investigated in different media: water, 42% ethanol aqueous solution, and pure ethanol. The kinetic assays results indicated that the adsorption equilibrium occurs after 10-40 min, being higher for alcoholic solutions. The higher capacity values were obtained in the 42% ethanol aqueous solution, in which N f values of 9.1 × 10 −4 mol g −1 , 5.9 × 10 −4 mol g −1 , and 5.1 × 10 −4 mol g −1 were obtained for Cu +2 , Co +2 , and Ni +2 , respectively.

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“…However, FA gas sensors, which are based on metal-oxide materials, have benefits that are mentioned above. Meanwhile, pure metal oxide structures react on FA at higher operating temperatures (300-400 • C) (Xu et al, 2014;Park et al, 2014) or room temperature with the assistance of UV LEDs (Chung et al, 2014;Li et al, 2015). Nanomaterials, such as carbon nanotubes (CNTs), metaloxide nanoparticles, nanotubes, nanowires and other various nanopattern formations are widely used in gas sensing structures due to their excellent responsive characteristics, mature preparation technology and low cost of mass production (Aroutiounian, 2015;Arafat et al, 2012;Korotcenkov et al, 2009;Aroutiounian et al, 2013;Feyzabad et al, 2012;Hieu et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Nanocomposite sensors of propylene glycol, dimethylformamide and formaldehyde vapors

Adamyan

Sayunts

Aroutiounian

et al. 2018

J. Sens. Sens. Syst.

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Abstract. The results of research works related to the study of thick-film multiwall carbon nanotube-tin oxide nanocomposite sensors of propylene glycol (PG), dimethylformamide (DMF) and formaldehyde (FA) vapors are presented in this paper. These sensors were derived using hydrothermal synthesis and sol-gel methods. Investigations of response-recovery characteristics in the 50-300 • C operating temperature range reveal that the optimal operating temperature for PG, DMF and FA vapor sensors, taking into account both high response and acceptable response and recovery times are about 200 and 220 • C, respectively. The dependence of the sensor response on gas concentration is linear in all cases. Minimal propylene glycol, dimethylformamide and formaldehyde gas concentrations, where the perceptible signal was noticed, were 13, 5 and 115 ppm, respectively.

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Highly sensitive and selective room-temperature formaldehyde sensors using hollow TiO2 microspheres

Cited by 124 publications

References 39 publications

UV Light Activated SnO2/ZnO Nanofibers for Gas Sensing at Room Temperature

UV Light Activated SnO2/ZnO Nanofibers for Gas Sensing at Room Temperature

The use of titanium (IV) phosphate for metal removal from aqueous and alcoholic samples

Nanocomposite sensors of propylene glycol, dimethylformamide and formaldehyde vapors

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