Electrically–transduced sensors, with their simplicity and compatibility with standard electronic technologies, produce signals that can be efficiently acquired, processed, stored, and analyzed. Two dimensional (2D) nanomaterials, including graphene, phosphorene (BP), transition metal dichalcogenides (TMDCs), and others, have proven to be attractive for the fabrication of high–performance electrically-transduced chemical sensors due to their remarkable electronic and physical properties originating from their 2D structure. This review highlights the advances in electrically-transduced chemical sensing that rely on 2D materials. The structural components of such sensors are described, and the underlying operating principles for different types of architectures are discussed. The structural features, electronic properties, and surface chemistry of 2D nanostructures that dictate their sensing performance are reviewed. Key advances in the application of 2D materials, from both a historical and analytical pers...

Electrically-Transduced Chemical Sensors Based on Two-Dimensional Nanomaterials

Green synthesis of silver nanoparticles using Coffea arabica seed extract and its antibacterial activity.

The features of conductometric gas sensors based on metal oxide composites are considered. The methods of the composites forming and the advantages of their using in the development of gas sensors are discussed. It is given the analysis of the factors that reduce the effectiveness of the composite using in conductometric gas sensors and can restrict application of nanocomposites in these devices. Technology features of composite synthesis and device fabrication, which should be taken into account while designing and fabricating sensors based on metal oxide composites, are considered. The mechanisms explaining the operation of conductometric gas sensors based on metal oxide composites are also discussed.

Metal oxide composites in conductometric gas sensors: Achievements and challenges

An ultrasensitive humidity sensor based on molybdenum-disulfide- (MoS2)-modified tin oxide (SnO2) nanocomposite has been demonstrated in this work. The nanostructural, morphological, and compositional properties of an as-prepared MoS2/SnO2 nanocomposite were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive spectrometry (EDS), nitrogen sorption analysis, and Raman spectroscopy, which confirmed its successful preparation and rationality. The sensing characteristics of the MoS2/SnO2 hybrid film device against relative humidity (RH) were investigated at room temperature. The RH sensing results revealed an unprecedented response, ultrafast response/recovery behaviors, and outstanding repeatability. To our knowledge, the sensor response yielded in this work was tens of times higher than that of the existing humidity sensors. Moreover, the MoS2/SnO2 hybrid nanocomposite film sensor exhibited great enhancement in humidity sensi...

Facile Fabrication of MoS2-Modified SnO2 Hybrid Nanocomposite for Ultrasensitive Humidity Sensing

Sulfate radical anion (SO4 −) based advanced oxidation technologies (AOTs) have received a great deal of attention due to their high reactivity with the organic contaminants and high selectivity in complex environmental matrices. Among all SO4 − activation techniques, the heterogeneous activation of precursor peroxides such as peroxymonosulfate (PMS) and persulfate (PS) by nanostructured materials has demonstrated to be an effective method to generate SO4 −. This paper reviews SO4 − chemistry and the nanostructured materials that can effectively activate PMS/PS, namely, transition metal-based nano-catalysts, carbon nanomaterials, and nano-composites. In addition, we also discuss the activation mechanisms of PMS/PS initiated by heterogeneous nanostructured materials, emphasizing their catalytic activity, stability, and reusability for the removal of organic contaminants. This review shows that nanostructured materials have promising potential in environmental remediation based on their excellent catalytic efficiency, large specific surface area, and controllable structure. It also provides perspective on potential future studies on the design of novel nanostructured materials and process development in the field of SO4 − based AOTs.

Activation of peroxymonosulfate/persulfate by nanomaterials for sulfate radical-based advanced oxidation technologies

Hybrid mesoporous metal oxides show promising attributes in the field of relative gas sensors due to the combined opportunities provided by the high specific surface area and framework components. In this study, we present the synthesis of Ag-doped ordered mesoporous tin(IV) oxide–titanium(IV) oxide nanohybrids using a sequential combination of a wet impregnation and nanocasting process and demonstrate the response by exposing the mesoporous nanohybrids to ethanol gas. HRTEM and N2 adsorption–desorption results indicate that the nanohybrids prepared by nanocasting of SBA-15 as the hard template possess an ordered mesoporous structure and high surface area. It was also observed that the mesoporous Ag-(TiO2/SnO2) shows excellent response towards ethanol with concentrations ranging from 1 ppm to 500 ppm. Besides, the nanohybrid mesoporous sensor shows high selectivity towards other volatile organic compounds (VOCs) including acetone, methanol, isopropanol, benzyl alcohol and ethyl acetate. All the results indicated that the nanocast mesoporous Ag-(TiO2/SnO2) nanohybrids have great potential for applications in designing high performance practical ethanol sensors.

/pdf/ordered-mesoporous-ag-doped-tio2-sno2-nanocomposite-based-5b3m6zxgcb.pdf

Ordered mesoporous Ag-doped TiO2/SnO2 nanocomposite based highly sensitive and selective VOC sensors

A highly sensitive and fast responsive relative humidity (% RH) sensor based on In–SnO2 loaded cubic mesoporous graphitic carbon nitride (g-C3N4) has been demonstrated in this study. The mesoporous In–SnO2/meso-CN nanohybrid was synthesized through template inversion of mesoporous silica, KIT-6, using a nanocasting process. Due to its 3D replicated cubic structure with ordered mesopores, the nanohybrid facilitates the process of adsorption, charge transmission and desorption of water molecules across the sensor surfaces. Consequently, the optimized In–SnO2/meso-CN nanohybrid exhibits excellent response (5 orders change in impedance) in the 11–98% RH range, high stability, negligible hysteresis (0.7%) and superior real time % RH detection performance. Compared to traditional metal oxide based resistive sensors with unique mesoporous/hierarchical/sheet-like morphology, the 3D mesostructured In–SnO2/meso-CN nanohybrid demonstrated a superfast response (3.5 s) and recovery (1.5 s) in the 11–98% RH range at room temperature. These results open the door for breath monitoring and show a promising glimpse for designing mesoporous 2D layered materials in the development of future ultra-sensitive % RH sensors.

An excellent humidity sensor based on In–SnO2 loaded mesoporous graphitic carbon nitride

Indium doped 2-D mesoporous (TiO2/WO3) nanohybrids possessing large intrinsic surface area and ordered pore channels were synthesized using mesoporous silica, SBA-15 as hard template through a simple nanocasting strategy. The TiO2/WO3 was synthesized as a result of negative replica of SBA-15 template during nanocasting process, which was further modified with Indium nanoparticles using wet impregnation technique. The nanohybrids were tested against the detection of important indoor flammable organic pollutants including n-butanol, toluene, benzene, xylene, 2-propanol and ethyl acetate. The sensing results illustrate that 1 wt% In-doped in TiO2/WO3 shows 2.65 times better response (R = 127.2 @ 200 °C) to 50 ppm n-butanol gas than pure TiO2/WO3 (R = 48 @ 210 °C) nanocomposite at relatively lower operating temperature. A fast response time (2.2 s), rapid recovery time (3 s), linear response, high stability and excellent selectivity were observed for the developed nanohybrid sensor. It is expected that the promising findings reported in this study can be extended to synthesize ordered mesoporous nanostructures which will be useful for the design and construction of futuristic e-nose with enhanced gas-sensing performance.

Ordered mesoporous In-(TiO2/WO3) nanohybrid: An ultrasensitive n-butanol sensor

Humidity sensing properties of Ag-loaded mesoporous silica SBA-15 nanocomposites prepared via hydrothermal process

Visible light-driven mesoporous Au–TiO2/SiO2 photocatalysts for advanced oxidation process

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Surender Duhan

Author Tools

Chat about Author