Electronic Noses: From Advanced Materials to Sensors Aided with Data Processing

A sub-ppm-level CO gas sensor based on copper oxide (CuO)-decorated graphene hybrid nanocomposite was reported in this paper. The CuO/graphene hierarchical nanocomposite was successfully deposited on a substrate with interdigital microelectrodes via layer-by-layer self-assembly technique. The morphologies, microstructures and compositions of the as-prepared CuO/rGO film were sufficiently characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD). The gas sensing properties of the CuO/graphene nanocomposite was investigated at room temperature over a wide range concentration of CO gas from 0.25 ppm to 1000 ppm. The experimental results exhibited not only an unprecedented detection abilities, but also fast response and recovery times, excellent repeatability, good stability and selectivity. The superior sensing mechanism for the presented sensor was ascribed to the hierarchical porous nanostructure and the formed heterojunction at the interfaces between CuO nanoflowers and rGO nanosheets.

Carbon monoxide gas sensing at room temperature using copper oxide-decorated graphene hybrid nanocomposite prepared by layer-by-layer self-assembly

NO x adsorption behavior on LaFeO 3 (LFO) and LaMnO 3+ δ (LMO) was characterized using temperature controlled methods and mass spectrometry. Temperature program desorption revealed decomposition of complex surface species formation when NO or NO 2 was adsorbed on LFO and LMO. LFO exhibited higher adsorption capacity for NO x species than LMO and was shown to be more active for NO x surface conversion. Both effects were attributed to the different B-site cations, with iron in LFO in the 3+ valence state, and manganese in LMO in the 3+ and 4+ valence states. Results from diffuse reflectance infrared spectroscopy were used to identify specific nitrite and nitrate species that are formed on the surfaces of LFO and LMO at room temperature. Temperature programmed reaction revealed a complex NO 2 decomposition mechanism to NO and O 2 for LFO and LMO in which the formation of nitrite and nitrate species serve as intermediates below ∼600 °C. NO x sensing mechanisms were considered and predicted based on the types and quantities of surface species formed.

NOx adsorption behavior of LaFeO3 and LaMnO3+δ and its influence on potentiometric sensor response

Effect of metal doping on carbon monoxide adsorption on phosphorene: A first-principles study

Gas-sensing performance of the electrochemical sensor utilized solid electrolyte of yttria-stabilized zirconia (YSZ) and metal-oxide sensing-electrode (SE) depends on electrochemical catalytic reaction at interface of metal-oxide/YSZ and heterogeneous gas-phase reaction through SE oxide. In this work, the mixed potential sensors with a configuration of Pt/YSZ/(Pt-LaFeO 3 ) sintered at the temperatures T s  = 700, 800, 900, 1050, 1200 and 1300 °C were investigated by exposing to various gases such as NO 2 , NO, CO, C 3 H 8 and CH 4 at the operating temperatures T o  = 450, 500, 550, 600 and 650 °C. All the sensors Pt/YSZ/(Pt-LaFeO 3 ) exhibited good sensitive and selective characteristics to NO 2 gas. Interesting characteristics on the gas sensing performances were obvious that the Δ V responses to NO 2 gas obtained the minimum and maximum values when the sensors Pt/YSZ/(Pt-LaFeO 3 ) sintered at the temperatures T s  = 900 and 1200 °C, respectively. Typically, the sensors exhibited decrease of NO 2 selectivity with increasing the sintering temperature T s . The t 90 response-recovery times of the sensors were relatively complicated with the sintering temperature. Effect of the sintering temperatures of the Pt/YSZ/LaFeO 3 sensors on the gas sensing performances was also discussed in detail.

Effect of sintering temperature of mixed potential sensor Pt/YSZ/LaFeO3 on gas sensing performance

Embodiments of the subject invention relate to a gas sensor and method for sensing one or more gases. An embodiment incorporates an array of sensing electrodes maintained at similar or different temperatures, such that the sensitivity and species selectivity of the device can be fine tuned between different pairs of sensing electrodes. A specific embodiment pertains to a gas sensor array for monitoring combustion exhausts and/or chemical reaction byproducts. An embodiment of the subject device related to this invention operates at high temperatures and can withstand harsh chemical environments. Embodiments of the device are made on a single substrate. The devices can also be made on individual substrates and monitored individually as if they were part of an array on a single substrate. The device can incorporate sensing electrodes in the same environment, which allows the electrodes to be coplanar and, thus, keep manufacturing costs low. Embodiments of the device can provide improvements to sensitivity, selectivity, and signal interference via surface temperature control.

Multifunctional potentiometric gas sensor array with an integrated temperature control and temperature sensors

a b s t r a c t The effects of electrical contact configuration for La2CuO4 sensing electrodes for a planar-based poten- tiometric gas sensor were studied in order to further quantify the effects of processing on sensor performance. Five configurations of La2CuO4 were used for the sensing electrode. The La2CuO4 sens- ing electrode was screen printed opposite a Pt counter electrode on a tape cast YSZ electrolyte. Three sensors were prepared for each configuration to test repeatability. Each sensor was tested at tempera- tures from 400 to 700 ◦C at various concentrations of NO2, NO, and CO in an environment of 3% O2 with a balance of N2. Results show that these sensors exhibit suitable sensitivity to all the gases tested. More importantly, it was shown that the sensitivity, selectivity/cross-sensitivity, and repeatability of these sensors are dependent on the sensing electrode configuration.

/pdf/la2cuo4-sensing-electrode-configuration-influence-on-3ciajvgjoz.pdf

La2CuO4 sensing electrode configuration influence on sensitivity and selectivity for a multifunctional potentiometric gas sensor

Electrode configurations for electric-field enhanced performance in catalysis and solid-state devices involving gases are provided. According to an embodiment, electric-field electrodes can be incorporated in devices such as gas sensors and fuel cells to shape an electric field provided with respect to sensing electrodes for the gas sensors and surfaces of the fuel cells. The shaped electric fields can alter surface dynamics, system thermodynamics, reaction kinetics, and adsorption/desorption processes. In one embodiment, ring-shaped electric-field electrodes can be provided around sensing electrodes of a planar gas sensor.

Electric-field enhanced performance in catalysis and solid-state devices involving gases

Ceramic fuel cells having enhanced flatness and strength are disclosed. The fuel cell can include a half-cell having, in order, a patterned layer, an anode support layer and an electrolyte layer. Methods of making ceramic fuel cells are also provided.

Ceramic fuel cell with enhanced flatness and strength and methods of making same

PROBLEM TO BE SOLVED: To provide a gas sensor with an electrode structure for enhancing performance by electric fields in catalysis and fixed devices (including gas sensors).SOLUTION: On the opposite side of a solid electrolyte 3 from sensing electrodes 1, 2 for a gas sensor, electric-field electrodes 6, 7 are provided that can generate electric fields. For the electric fields generated, different charging schemes may be used to get variations in the gas sensor sensitivity, selectivity, response time, etc. These pieces of information are detected as EMF variations between the electrodes 1, 2.

Enhancement of performance by electric field in catalysis and solid-state devices

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.

Bryan M. Blackburn

Author Tools

Chat about Author