scholarly journals Nanoengineering Approaches Toward Artificial Nose

2021 ◽  
Vol 9 ◽  
Author(s):  
Sanggon Kim ◽  
Jacob Brady ◽  
Faraj Al-Badani ◽  
Sooyoun Yu ◽  
Joseph Hart ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Gas Sensing ◽  
High Surface ◽  
High Surface Area ◽  
Transition Metal Dichalcogenides ◽  
Sensor Arrays ◽  
Artificial Nose ◽  
Electrical Sensing ◽  
Sensitivity And Selectivity ◽  
Metal Dichalcogenides

Significant scientific efforts have been made to mimic and potentially supersede the mammalian nose using artificial noses based on arrays of individual cross-sensitive gas sensors over the past couple decades. To this end, thousands of research articles have been published regarding the design of gas sensor arrays to function as artificial noses. Nanoengineered materials possessing high surface area for enhanced reaction kinetics and uniquely tunable optical, electronic, and optoelectronic properties have been extensively used as gas sensing materials in single gas sensors and sensor arrays. Therefore, nanoengineered materials address some of the shortcomings in sensitivity and selectivity inherent in microscale and macroscale materials for chemical sensors. In this article, the fundamental gas sensing mechanisms are briefly reviewed for each material class and sensing modality (electrical, optical, optoelectronic), followed by a survey and review of the various strategies for engineering or functionalizing these nanomaterials to improve their gas sensing selectivity, sensitivity and other measures of gas sensing performance. Specifically, one major focus of this review is on nanoscale materials and nanoengineering approaches for semiconducting metal oxides, transition metal dichalcogenides, carbonaceous nanomaterials, conducting polymers, and others as used in single gas sensors or sensor arrays for electrical sensing modality. Additionally, this review discusses the various nano-enabled techniques and materials of optical gas detection modality, including photonic crystals, surface plasmonic sensing, and nanoscale waveguides. Strategies for improving or tuning the sensitivity and selectivity of materials toward different gases are given priority due to the importance of having cross-sensitivity and selectivity toward various analytes in designing an effective artificial nose. Furthermore, optoelectrical sensing, which has to date not served as a common sensing modality, is also reviewed to highlight potential research directions. We close with some perspective on the future development of artificial noses which utilize optical and electrical sensing modalities, with additional focus on the less researched optoelectronic sensing modality.

scholarly journals Ni3Se4@MoSe2 Composites for Hydrogen Evolution Reaction

2019 ◽  
Vol 9 (23) ◽  
pp. 5035 ◽  
Author(s):  
Wenwu Guo ◽  
Quyet Van Le ◽  
Ha Huu Do ◽  
Amirhossein Hasani ◽  
Mahider Tekalgne ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Performance Improvement ◽  
Hydrogen Evolution Reaction ◽  
High Surface ◽  
High Surface Area ◽  
Transition Metal Dichalcogenides ◽  
Accelerate Electron ◽  
Highly Active ◽  
Metal Dichalcogenides

Transition metal dichalcogenides (TMDs) have been considered as one of the most promising electrocatalysts for the hydrogen evolution reaction (HER). Many studies have demonstrated the feasibility of significant HER performance improvement of TMDs by constructing composite materials with Ni-based compounds. In this work, we prepared Ni3Se4@MoSe2 composites as electrocatalysts for the HER by growing in situ MoSe2 on the surface of Ni3Se4 nanosheets. Electrochemical measurements revealed that Ni3Se4@MoSe2 nanohybrids are highly active and durable during the HER process, which exhibits a low onset overpotential (145 mV) and Tafel slope (65 mV/dec), resulting in enhanced HER performance compared to pristine MoSe2 nanosheets. The enhanced HER catalytic activity is ascribed to the high surface area of Ni3Se4 nanosheets, which can both efficiently prevent the agglomeration issue of MoSe2 nanosheets and create more catalytic edge sites, hence accelerate electron transfer between MoSe2 and the working electrode in the HER. This approach provides an effective pathway for catalytic enhancement of MoSe2 electrocatalysts and can be applied for other TMD electrocatalysts.

scholarly journals Metal Oxide Semiconductor: Future Material for Gas Sensors and it’s Synthesis Techniques

2019 ◽  
Vol 8 (6S3) ◽  
pp. 1615-1619
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
Oxide Semiconductors ◽  
Methods Of Synthesis

This paper provides a complete idea about metal oxide semiconductors ((MOSs) for gas sensing application. Metal oxide semiconductor nano-materials are showing much higher strength in many industries, research laboratories and public health and so on with their effective chemical, physical, and electronic properties. The morphology, band gap, porosity, conductivity properties, low cost and high surface area etc. are few of the properties of MOSs that are responsible for the enhancement of sensing properties in various applications. Besides these, now-a-days MOSs are grown in different nanostructures like nano rods, nano flowers, nano sheets, nanowires etc. using the various growth techniques which are further responsible for their betterment as gas sensors. Therefore, this paper gives a complete idea about the different methods of synthesis of MOSs.

scholarly journals Transition Metal Dichalcogenides (TMDC)-Based Nanozymes for Biosensing and Therapeutic Applications

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 337
Author(s):  
Dario Presutti ◽  
Tarun Agarwal ◽  
Atefeh Zarepour ◽  
Nehar Celikkin ◽  
Sara Hooshmand ◽  
...  
Keyword(s):  
Transition Metal ◽  
High Surface ◽  
High Surface Area ◽  
Transition Metal Dichalcogenides ◽  
Enzymatic Properties ◽  
Promising Alternative ◽  
Therapeutic Applications ◽  
Semiconducting Properties ◽  
Metal Dichalcogenides ◽  
And Control

Nanozymes, a type of nanomaterial with enzyme-like properties, are a promising alternative to natural enzymes. In particular, transition metal dichalcogenides (TMDCs, with the general formula MX2, where M represents a transition metal and X is a chalcogen element)-based nanozymes have demonstrated exceptional potential in the healthcare and diagnostic sectors. TMDCs have different enzymatic properties due to their unique nano-architecture, high surface area, and semiconducting properties with tunable band gaps. Furthermore, the compatibility of TMDCs with various chemical or physical modification strategies provide a simple and scalable way to engineer and control their enzymatic activity. Here, we discuss recent advances made with TMDC-based nanozymes for biosensing and therapeutic applications. We also discuss their synthesis strategies, various enzymatic properties, current challenges, and the outlook for future developments in this field.

scholarly journals Nanostructured Metal Oxide-Based Acetone Gas Sensors: A Review

Sensors ◽  
2020 ◽  
Vol 20 (11) ◽  
pp. 3096 ◽  
Author(s):  
Vahid Amiri ◽  
Hossein Roshan ◽  
Ali Mirzaei ◽  
Giovanni Neri ◽  
Ahmad I. Ayesh
Keyword(s):  
Metal Oxide ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Human Life ◽  
High Surface ◽  
High Surface Area ◽  
High Sensitivity ◽  
Volatile Organic ◽  
Resistive Gas Sensors ◽  
Nanostructured Metal

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.

scholarly journals Synthesis of Pd-loaded mesoporous SnO2 hollow spheres for highly sensitive and stable methane gas sensors

RSC Advances ◽  
2018 ◽  
Vol 8 (43) ◽  
pp. 24268-24275 ◽  
Author(s):  
Liping Yang ◽  
Zhou Wang ◽  
Xinyuan Zhou ◽  
Xiaofeng Wu ◽  
Ning Han ◽  
...  
Keyword(s):  
Surface Area ◽  
Gas Sensors ◽  
Gas Sensing ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Methane Gas ◽  
Highly Sensitive ◽  
Mesoporous Sno2 ◽  
Sensing Performance

This work reports a simple, rapid, effective and reliable CH4 sensor based on Pd-loaded SnO2 hollow spheres with high surface area and porosity, which is of great importance to gas sensing performance.

Functionalization of Transition Metal Dichalcogenides with Metallic Nanoparticles: Implications for Doping and Gas-Sensing

Nano Letters ◽  
2015 ◽  
Vol 15 (5) ◽  
pp. 2852-2862 ◽  
Author(s):  
Deblina Sarkar ◽  
Xuejun Xie ◽  
Jiahao Kang ◽  
Haojun Zhang ◽  
Wei Liu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metallic Nanoparticles ◽  
Gas Sensing ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides

scholarly journals Diatoms - nature materials with great potential for bioapplications

2016 ◽  
Vol 70 (6) ◽  
pp. 613-627 ◽  
Author(s):  
Djordje Medarevic ◽  
Dusan Losic ◽  
Svetlana Ibric
Keyword(s):  
Drug Delivery ◽  
Gas Sensing ◽  
High Surface ◽  
High Surface Area ◽  
Raw Material ◽  
Nanoporous Structure ◽  
Mechanical Resistance ◽  
Diatom Frustule ◽  
Wide Availability ◽  
Made In

Diatoms are widespread unicellular photosynthetic algae that produce unique highly ordered siliceous cell wall, called frustule. Micro- to nanoporous structure with high surface area that can be easily modified, high mechanical resistance, unique optical features (light focusing and luminescence) and biocompatibility make diatom frustule as a suitable raw material for the development of devices such as bio- and gas sensors, microfluidic particle sorting devices, supercapacitors, batteries, solar cells, electroluminescent devices and drug delivery systems. Their wide availability in the form of fossil remains (diatomite or diatomaceous earth) as well as easy cultivation in the artificial conditions further supports use of diatoms in many different fields of application. This review focused on the recent achievements in the diatom bioapplications such as drug delivery, biomolecules immobilization, bio- and gas sensing, since great progress was made in this field over the last several years.

scholarly journals A Review of Carbon Nanotubes-Based Gas Sensors

2009 ◽  
Vol 2009 ◽  
pp. 1-24 ◽  
Author(s):  
Yun Wang ◽  
John T. W. Yeow
Keyword(s):  
Carbon Nanotubes ◽  
Gas Sensors ◽  
Gas Sensing ◽  
Low Cost ◽  
High Surface ◽  
Hollow Structure ◽  
Volume Ratio ◽  
Fast Response ◽  
Sensing Technology ◽  
Structure Of Nanomaterials

Gas sensors have attracted intensive research interest due to the demand of sensitive, fast response, and stable sensors for industry, environmental monitoring, biomedicine, and so forth. The development of nanotechnology has created huge potential to build highly sensitive, low cost, portable sensors with low power consumption. The extremely high surface-to-volume ratio and hollow structure of nanomaterials is ideal for the adsorption of gas molecules. Particularly, the advent of carbon nanotubes (CNTs) has fuelled the inventions of gas sensors that exploit CNTs' unique geometry, morphology, and material properties. Upon exposure to certain gases, the changes in CNTs' properties can be detected by various methods. Therefore, CNTs-based gas sensors and their mechanisms have been widely studied recently. In this paper, a broad but yet in-depth survey of current CNTs-based gas sensing technology is presented. Both experimental works and theoretical simulations are reviewed. The design, fabrication, and the sensing mechanisms of the CNTs-based gas sensors are discussed. The challenges and perspectives of the research are also addressed in this review.

Nanomaterial-based gas sensors used for breath diagnosis

2020 ◽  
Vol 8 (16) ◽  
pp. 3231-3248 ◽  
Author(s):  
Xinyuan Zhou ◽  
Zhenjie Xue ◽  
Xiangyu Chen ◽  
Chuanhui Huang ◽  
Wanqiao Bai ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Gas Sensors ◽  
Active Sites ◽  
Gas Sensing ◽  
High Surface ◽  
Volume Ratio ◽  
Sensing Applications ◽  
Enormous Number

Gas-sensing applications commonly use nanomaterials (NMs) because of their unique physicochemical properties, including a high surface-to-volume ratio, enormous number of active sites, controllable morphology, and potential for miniaturisation.

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