NiO-wrapped mesoporous TiO2 microspheres based selective ammonia sensor at room temperature

Li, Xiaogan; Chen, Ning; Lin, Shiwei; Wang, Jing; Zhang, Jianwei

doi:10.1016/j.snb.2014.12.031

Cited by 61 publications

(29 citation statements)

References 34 publications

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“…The corresponding chemoresistive sensors also indicated high sensitivity and selectivity to formaldehyde at room temperatures with the illumination of only 2.5 mW powered UV LED offering significant savings on the total energy consumption. With the ultra thin walls of the hollow microspheres, the detection limit could go down to sub-ppm level and response/recovery time could decrease down to less than 1 min, which significantly surpass the various nanostructured TiO 2 based sensors reported in literature [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 80%

“…The photodetector was periodically exposed to a 365 nm UV LED (2.5 mW) and the resistance change of the detector induced by photon was monitored. The chemoresistive sensors were tested in a sealed chamber in which different concentrations of analytes were achieved by vaporizing the corresponding liquids [23][24][25]. The resistance of the photodectors and the chemical sensors was measured using a digital electromultimeter (Agilent 34410A, USA).…”

Section: Sensor Fabrication and Electrical Measurementsmentioning

confidence: 99%

“…XPS result (Fig. S1 in supplementary information) indicates the presence of Ti 4+ and surface OH groups [23][24][25]. Supplementary Fig.…”

Section: Sensor Fabrication and Electrical Measurementsmentioning

confidence: 99%

“…This chemophysical phenomenon has actually been studied recently for implementing a room temperature VOC sensor with assistance of UV LED photon energy [17][18][19][20][21][22][23][24][25][26]. It indicated that tens of milliwatts powered UV LED could help the chemoresistive gas sensors operate at room temperature significantly decreasing the power consumption [19][20][21][22][23][24][25][26]. However, the sensor showed similar response to several VOCs indicating poor selectivity along with sluggish response/recovery behavior.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

et al. 2015

Sensors and Actuators B: Chemical

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124

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Section: Introductionmentioning

confidence: 80%

Section: Sensor Fabrication and Electrical Measurementsmentioning

confidence: 99%

“…XPS result (Fig. S1 in supplementary information) indicates the presence of Ti 4+ and surface OH groups [23][24][25]. Supplementary Fig.…”

Section: Sensor Fabrication and Electrical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wang

et al. 2015

Sensors and Actuators B: Chemical

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124

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“…It is a promising photocatalyst that widely used in applications such as hydrogen production, gas sensors, photocatalytic activities for photocatalytic degradation of organic pollutants, dye-sensitized solar cells, and photoelectrochemical cells because of its relative high efficiency and high stability [1][2][3][4][5][6][7][8]. However, due to its wide band gap energy, TiO 2 is active only under UV irradiation.…”

Section: Introductionmentioning

confidence: 99%

Efficient sunlight-driven photocatalytic activity of chromium TiO2 nanotube nanocomposites prepared by anodizing and chemical bath deposition

Ghayeb

Momeni

2015

J Mater Sci: Mater Electron

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Different chromium-sensitized TiO 2 nanotube (CrTNs) nanocomposites were fabricated by anodizing of titanium in combination with a chemical bath deposition and pyrolysis process. The morphology and structure were characterized by field-emission scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. Optical properties were investigated by ultra UV-Vis diffuse reflectance spectra. The resulting CrTNs showed a tube diameter of 90-140 nm, wall thickness of 20-50 nm and tube lengths in the range of *30 lm. The photocatalytic activity of the CrTNs was evaluated by measuring the degradation of methylene blue dye under simulated sunlight conditions and compared with photocatalytic activity of bare titanium dioxide nanotubes. The sample CrTN-3, that formed by anodizing of titanium in ethylene glycol electrolyte and then soaked in a H 2 O/ethanol (4:1) solution containing 0.05 M CrCl 3 Á6H 2 O for 3 h at 70°C, exhibited better photocatalytic activity than other CrTNs samples. The process developed in this study is facile, reproducible, and inexpensive, and can be easily scaled up, thereby pioneering the fabrication of high performance photocatalysts with promising environmental applications.

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Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

2020

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With rapid progress in device integration and computing power, the realization of highly miniaturized one-chip artificial olfaction with superior performance is close and should be further supported by the rational design of chemical sensors and chemical sensing materials. The number of gas sensors tends to increase in order to sniff more complex odors with the progress of civilization. This explains the evolution from a single chemical sensor to complicated artificial olfaction using sensor arrays. At the advent of oxide chemiresistive gas sensors in the 1960s and 1970s, a single gas sensor was widely used to detect toxic, explosive, dangerous, and harmful gases, such as CO, C 3 H 8 , CH 4 , H 2 S, and NO 2 , in a selective manner. [26,27] However, a single sensor is often insufficient for recognizing most of the natural odors encountered in daily life, which consist of hundreds to thousands of different chemicals. [28] In the mammalian olfactory system, odorants are initially detected by olfactory receptors (ORs) covering the surface of the cilia projected from olfactory sensory neurons (OSNs), which are located in the olfactory epithelium lining the nasal cavity. These signals are transmitted to the glomeruli in the olfactory bulb, where a high degree of signal integration happens (Figure 1a). [29] Finally, the signals are sent through mitral cells to a higher brain region (olfactory cortex), and the signals are subsequently combined or modified in a variety of ways by parallel processing for analysis and interpretation (Figure 1b). [30] Each OR can detect various kinds of odorants, and similarly, each odorant can also be recognized by a number of ORs. That is, the olfactory system determines multiple odorants from various combinations of ORs (Figure 1c). [31] For better olfaction, both OSNs and ORs should be abundant. A larger number of OSNs is advantageous for detecting trace concentrations of analytes and ligands. [32] For instance, dogs with more OSNs are better than humans at detecting explosives, searching and rescuing, diagnosing disease, and assessing agricultural products. [33] If a mammal can detect larger numbers of faint gas components within odors, he can perceive and identify the odors more accurately. From this perspective, gas sensors with lower detection limits would be assembled to the stronger artificial olfaction. Kinds of ORs are also important. Mammals are known to have ≈1000 different kinds of ORs, and combinations of dissimilar ORs enable the discrimination of a myriad of odorants. [29] To mimic this, sensor arrays consisting of small number (5-20) of sensors that show Artificial olfaction based on gas sensor arrays aims to substitute for, support, and surpass human olfaction. Like mammalian olfaction, a larger number of sensors and more signal processing are crucial for strengthening artificial olfaction. Due to rapid progress in computing capabilities and machinelearning algorithms, on-demand high-performance artificial olfaction that can eclipse human olfaction becomes inevitable onc...

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NiO-wrapped mesoporous TiO2 microspheres based selective ammonia sensor at room temperature

Cited by 61 publications

References 34 publications

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

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

Efficient sunlight-driven photocatalytic activity of chromium TiO2 nanotube nanocomposites prepared by anodizing and chemical bath deposition

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

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