Micropatterning of metal oxide nanofibers by electrohydrodynamic (EHD) printing towards highly integrated and multiplexed gas sensor applications

Kang, Kyungnam; Yang, Daejong; Park, Jaeho; Kim, Sang Hyeok; Cho, In-Cheol; Yang, Hyun‐Ho; Cho, Minkyu; Mousavi, Saeb; Choi, Kyung Hyun; Park, Inkyu

doi:10.1016/j.snb.2017.04.194

Cited by 80 publications

(53 citation statements)

References 44 publications

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“…Accordingly, it would be better to use highly standardized, reproducible, and thermally stable oxide particles that can be dispersed and mixed in a uniform manner. Because the uniform mixing of two different dry oxide NPs is challenging, the intimate mixing of two different oxide NPs in a slurry state and subsequent deposition of slurry onto microelectrodes via microdispensing, ink-jet printing, [347][348][349][350][351] and direct electrohydrodynamic (EHD) patterning [352][353][354][355][356] can be considered for fabricating sensing film in a reproducible manner.…”

Section: Oxide-oxide Heterocompositesmentioning

confidence: 99%

Section: Artificial Olfaction Using Oxide Semiconductor Gas Sensorsmentioning

confidence: 99%

“…EHD printing can decrease sensing areas because a very small amount of slurry is ejected when the intense pulse electric field is applied between the nozzle and substrate. For instance, Kang et al [ 354 ] formed a narrow sensing area (diameter: 40–70 µm) by EHD‐coating slurries containing SnO 2 , In 2 O 3 , WO 3 , and NiO nanofibers on the sensor array (Figure 22e,f).…”

Section: Artificial Olfaction: State‐of‐the‐art and Strategies For Inmentioning

confidence: 99%

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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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Section: Oxide-oxide Heterocompositesmentioning

confidence: 99%

Section: Artificial Olfaction Using Oxide Semiconductor Gas Sensorsmentioning

confidence: 99%

Section: Artificial Olfaction: State‐of‐the‐art and Strategies For Inmentioning

confidence: 99%

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

2020

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“…11−13 For detecting NO 2 , a number of gas sensors based on semiconductors have been developed (see Table S1, Supporting Information). 14,15 Because of the chemical stability and low cost, NO 2 sensors based on metal oxides, such as ZnO, 16−18 SnO 2 , 19−21 WO 3 , 22−24 Fe 2 O 3 , 25,26 and NiO, 27,28 have widely been reported. Because of the high operating temperatures (higher than 200–600 °C), these sensors are limited in the practical applications.…”

Section: Introductionmentioning

confidence: 99%

Graphene-Modified ZnO Nanostructures for Low-Temperature NO₂ Sensing

et al. 2019

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This paper develops a novel ultrasonic spray-assisted solvothermal (USS) method to synthesize wrapped ZnO/reduced graphene oxide (rGO) nanocomposites with a Schottky junction for gas-sensing applications. The as-obtained ZnO/rGO- x samples with different graphene oxide (GO) contents ( x = 0–1.5 wt %) are characterized by various techniques, and their gas-sensing properties for NO 2 and other VOC gases are also evaluated. The results show that the USS-derived ZnO/rGO samples exhibit high NO 2 -sensing property at low operating temperatures (e.g., 70–130 °C) because of their high specific surface area and porous structures when compared with the ZnO/rGO sample obtained by the traditional precipitation method. The content of rGO shows an obvious effect on their NO 2 -sensing properties, and the ZnO/rGO-0.5 sample has a high response of 62 operating at 130 °C, three times that of pure ZnO. The detection limit of the ZnO/rGO-0.5 sensor to NO 2 is as low as 10 ppb under the present test condition. In addition, the ZnO/rGO-0.5 sensor shows a highly selective response to NO 2 gas when compared with organic vapors and other inflammable or toxic gases. The theoretical and experimental analyses indicate that the enhancement in NO 2 -sensing performance of the ZnO/rGO sensor is attributed to the formation of wrapped ZnO/rGO Schottky junctions.

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“…In past decades, gas sensors based on metal oxide semiconductors have drawn much attention for wide applications [ 1 , 2 , 3 , 4 , 5 ] such as environmental monitoring, industrial process control, and for the detection of the chemical or toxic substrates. Recently, the gas sensors composed of nanostructured semiconductors, such as nanowires, nanoparticles, nanorods, and nanobelts, show better sensitivities to different gases [ 6 , 7 , 8 , 9 ]. The sensors with nanostructures have been demonstrated to be excellent candidates for high sensitivity due to their high surface to volume ratio.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of a P3HT-ZnO Nanowires Gas Sensor Detecting Ammonia Gas

Kuo

Chen

Chao

et al. 2017

Sensors

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In this study, an organic-inorganic semiconductor gas sensor was fabricated to detect ammonia gas. An inorganic semiconductor was a zinc oxide (ZnO) nanowire array produced by atomic layer deposition (ALD) while an organic material was a p-type semiconductor, poly(3-hexylthiophene) (P3HT). P3HT was suitable for the gas sensing application due to its high hole mobility, good stability, and good electrical conductivity. In this work, P3HT was coated on the zinc oxide nanowires by the spin coating to form an organic-inorganic heterogeneous interface of the gas sensor for detecting ammonia gas. The thicknesses of the P3HT were around 462 nm, 397 nm, and 277 nm when the speeds of the spin coating were 4000 rpm, 5000 rpm, and 6000 rpm, respectively. The electrical properties and sensing characteristics of the gas sensing device at room temperature were evaluated by Hall effect measurement and the sensitivity of detecting ammonia gas. The results of Hall effect measurement for the P3HT-ZnO nanowires semiconductor with 462 nm P3HT film showed that the carrier concentration and the mobility were 2.7 × 1019 cm−3 and 24.7 cm2∙V−1∙s−1 respectively. The gas sensing device prepared by the P3HT-ZnO nanowires semiconductor had better sensitivity than the device composed of the ZnO film and P3HT film. Additionally, this gas sensing device could reach a maximum sensitivity around 11.58 per ppm.

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Micropatterning of metal oxide nanofibers by electrohydrodynamic (EHD) printing towards highly integrated and multiplexed gas sensor applications

Cited by 80 publications

References 44 publications

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

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

Graphene-Modified ZnO Nanostructures for Low-Temperature NO₂ Sensing

Fabrication of a P3HT-ZnO Nanowires Gas Sensor Detecting Ammonia Gas

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Micropatterning of metal oxide nanofibers by electrohydrodynamic (EHD) printing towards highly integrated and multiplexed gas sensor applications

Cited by 80 publications

References 44 publications

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

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

Graphene-Modified ZnO Nanostructures for Low-Temperature NO2 Sensing

Fabrication of a P3HT-ZnO Nanowires Gas Sensor Detecting Ammonia Gas

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Product

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Graphene-Modified ZnO Nanostructures for Low-Temperature NO₂ Sensing