Gas Sensors Based on Chemi-Resistive Hybrid Functional Nanomaterials

Jian, Yingying; Hu, Wenwen; Zhao, Zhenhuan; Cheng, Pengfei; Haick, Hossam; Yao, Ming‐Shui; Wu, Weiwei

doi:10.1007/s40820-020-0407-5

Cited by 292 publications

(190 citation statements)

References 329 publications

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“…Gas sensors are electrical devices that can produce an electrical signal in the presence of target gases [27]. A practical gas sensor must be highly sensitive, selective, stable, and fast, with low prices, and requires low operational power [28]. Furthermore, gas sensors should have a high signal-to-noise ratio (S/N), which indicates the relative gas signal intensity over noise intensity.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Metal Oxide-Based Acetone Gas Sensors: A Review

Amiri

Roshan

Mirzaei

et al. 2020

Sensors

164

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Acetone is a well-known volatile organic compound that is widely used in different industrial and domestic areas. However, it can have dangerous effects on human life and health. Thus, the realization of sensitive and selective sensors for recognition of acetone is highly important. Among different gas sensors, resistive gas sensors based on nanostructured metal oxide with high surface area, have been widely reported for successful detection of acetone gas, owing to their high sensitivity, fast dynamics, high stability, and low price. Herein, we discuss different aspects of metal oxide-based acetone gas sensors in pristine, composite, doped, and noble metal functionalized forms. Gas sensing mechanisms are also discussed. This review is an informative document for those who are working in the field of gas sensors.

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Section: Introductionmentioning

confidence: 99%

Nanostructured Metal Oxide-Based Acetone Gas Sensors: A Review

Amiri

Roshan

Mirzaei

et al. 2020

Sensors

164

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“…When the conducting polymer matrix is embedded with inorganic nanomaterials, a P-N or Schottky heterojunction is formed at the conducting polymer/inorganic interfaces, depending upon the nature of inorganic nanomaterials [11][12][13][14][15][16]. Taking it for an example, when n-type metal oxide nanostructures are introduced into the polymer matrix, a P-N heterojunction is formed at the polymer-metal oxide interfaces, accompanying with the formation of depletion region in both polymer and metal oxides [16].…”

Section: Constructing P-n or Schottky Heterojunctionsmentioning

confidence: 99%

“…A highly porous layer with large surface area, high pore volume and desired pore size could introduce more active sites and increase the gas molecule absorption. By introducing inorganic nanomaterials, the film morphology of the nanocomposite films and the gas sensing performances can be adjusted freely [13,15,[16][17][18][19][20]. The inorganic nanomaterials could be a template for the polymerization of conducting polymers, where the nanocomposite morphology could be determined by the inorganic nanomaterials and polymerization methods.…”

Section: Modulating Film Morphologymentioning

confidence: 99%

Conducting polymer-inorganic nanocomposite-based gas sensors: a review

Yan

Yang

et al. 2020

Science and Technology of Advanced Materials

110

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With the rapid development of conductive polymers, they have shown great potential in room-temperature chemical gas detection, as their electrical conductivity can be changed upon exposure to oxidative or reductive gas molecules at room temperature. However, due to their relatively low conductivity and high affinity toward volatile organic compounds and water molecules, they always exhibit low sensitivity, poor stability, and gas selectivity, which hinder their practical gas sensor applications. In addition, inorganic sensitive materials show totally different advantages in gas sensors, such as high sensitivity, fast response to low concentration analytes, high surface area, and versatile surface chemistry, which could complement the conducting polymers in terms of the sensing characteristics. It seems to be a win-win choice to combine inorganic sensitive materials with polymers for gas detection due to their synergistic effects, which has attracted extensive interests in gas-sensing applications. In this review, we summarize the recent development in polymer-inorganic nanocomposite based gas sensors. The roles of inorganic nanomaterials in improving the gas-sensing performances of conducting polymers are introduced and the progress of conducting polymer-inorganic nanocomposites including metal oxides, metal, carbon (carbon nanotube, graphene), and ternary composites are presented. Finally, a conclusion and a perspective in the field of gas sensors incorporating conducting polymer-inorganic nanocomposite are summarized.

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“…The polymer variants operate at room temperature but suffer from similar issues to CBPC sensors. The metal-oxide composite variants operate at elevated temperature and have better selectivity than normal MOS sensors, but are more challenging to fabricate [57,58]. QMB sensors have good precision for a diverse range of VOCs, but require complex circuitry, have a poor signal-to-noise ratio, and are sensitive to humidity and temperature [56].…”

Section: Volatile Organic Compounds Detection Technology and Data Anamentioning

confidence: 99%

Sniffing Out Urinary Tract Infection—Diagnosis Based on Volatile Organic Compounds and Smell Profile

2020

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Current available methods for the clinical diagnosis of urinary tract infection (UTI) rely on a urine dipstick test or culturing of pathogens. The dipstick test is rapid (available in 1–2 min), but has a low positive predictive value, while culturing is time-consuming and delays diagnosis (24–72 h between sample collection and pathogen identification). Due to this delay, broad-spectrum antibiotics are often prescribed immediately. The over-prescription of antibiotics should be limited, in order to prevent the development of antimicrobial resistance. As a result, there is a growing need for alternative diagnostic tools. This paper reviews applications of chemical-analysis instruments, such as gas chromatography–mass spectrometry (GC-MS), selected ion flow tube mass spectrometry (SIFT-MS), ion mobility spectrometry (IMS), field asymmetric ion mobility spectrometry (FAIMS) and electronic noses (eNoses) used for the diagnosis of UTI. These methods analyse volatile organic compounds (VOCs) that emanate from the headspace of collected urine samples to identify the bacterial pathogen and even determine the causative agent’s resistance to different antibiotics. There is great potential for these technologies to gain wide-spread and routine use in clinical settings, since the analysis can be automated, and test results can be available within minutes after sample collection. This could significantly reduce the necessity to prescribe broad-spectrum antibiotics and allow the faster and more effective use of narrow-spectrum antibiotics.

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Gas Sensors Based on Chemi-Resistive Hybrid Functional Nanomaterials

Cited by 292 publications

References 329 publications

Nanostructured Metal Oxide-Based Acetone Gas Sensors: A Review

Nanostructured Metal Oxide-Based Acetone Gas Sensors: A Review

Conducting polymer-inorganic nanocomposite-based gas sensors: a review

Sniffing Out Urinary Tract Infection—Diagnosis Based on Volatile Organic Compounds and Smell Profile

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