sensing material
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Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 329
Author(s):  
Mohd Hafiz Abu Bakar ◽  
Nur Hidayah Azeman ◽  
Nadhratun Naiim Mobarak ◽  
Nur Afifah Ahmad Nazri ◽  
Tengku Hasnan Tengku Abdul Aziz ◽  
...  

This research investigates the physicochemical properties of biopolymer succinyl-κ-carrageenan as a potential sensing material for NH4+ Localized Surface Plasmon Resonance (LSPR) sensor. Succinyl-κ-carrageenan was synthesised by reacting κ-carrageenan with succinic anhydride. FESEM analysis shows succinyl-κ-carrageenan has an even and featureless topology compared to its pristine form. Succinyl-κ-carrageenan was composited with silver nanoparticles (AgNP) as LSPR sensing material. AFM analysis shows that AgNP-Succinyl-κ-carrageenan was rougher than AgNP-Succinyl-κ-carrageenan, indicating an increase in density of electronegative atom from oxygen compared to pristine κ-carrageenan. The sensitivity of AgNP-Succinyl-κ-carrageenan LSPR is higher than AgNP-κ-carrageenan LSPR. The reported LOD and LOQ of AgNP-Succinyl-κ-carrageenan LSPR are 0.5964 and 2.7192 ppm, respectively. Thus, AgNP-Succinyl-κ-carrageenan LSPR has a higher performance than AgNP-κ-carrageenan LSPR, broader detection range than the conventional method and high selectivity toward NH4+. Interaction mechanism studies show the adsorption of NH4+ on κ-carrageenan and succinyl-κ-carrageenan were through multilayer and chemisorption process that follows Freundlich and pseudo-second-order kinetic model.


Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 228
Author(s):  
Pengyu Ren ◽  
Lingling Qi ◽  
Kairui You ◽  
Qingwei Shi

The indoor environment of buildings affects people’s daily life. Indoor harmful gases include volatile organic gas and greenhouse gas. Therefore, the detection of harmful gas by gas sensors is a key method for developing green buildings. The reasonable design of SnO2-sensing materials with excellent structures is an ideal choice for gas sensors. In this study, three types of hierarchical SnO2 microspheres assembled with one-dimensional nanorods, including urchin-like microspheres (SN-1), flower-like microspheres (SN-2), and hydrangea-like microspheres (SN-3), are prepared by a simple hydrothermal method and further applied as gas-sensing materials for an indoor formaldehyde (HCHO) gas-sensing test. The SN-1 sample-based gas sensor demonstrates improved HCHO gas-sensing performance, especially demonstrating greater sensor responses and faster response/recovery speeds than SN-2- and SN-3-based gas sensors. The improved HCHO gas-sensing properties could be mainly attributed to the structural difference of smaller nanorods. These results further indicate the uniqueness of the structure of the SN-1 sample and its suitability as HCHO- sensing material.


2022 ◽  
Vol 9 (1) ◽  
Author(s):  
Tej Poudel Chhetri ◽  
Lei Kerr ◽  
Nada Masmali ◽  
Herbert Jaeger ◽  
Khalid F. Eid

Nanostructured ZnO has been widely investigated as a gas sensing material. Antimony is an important dopant for ZnO that catalyses its surface reactivity and thus strengthens its gas sensing capability. However, there are not enough studies on the gas sensing of antimony-doped ZnO single wires. We fabricated and characterized ZnO/ZnO:Sb core–shell micro-wires and demonstrated that individual wires are sensitive to oxygen gas flow. Temperature and light illumination strongly affect the oxygen gas sensitivity and stability of these individual wires. It was found that these micro- and nano-wire oxygen sensors at 200°C give the highest response to oxygen, yet a vanishingly small effect of light and temperature variations. The underlying physics and the interplay between these effects are discussed in terms of surface-adsorbed oxygen, oxygen vacancies and hydrogen doping.


2021 ◽  
Vol 6 ◽  
Author(s):  
Lorenza Mondada

This article explores the grammar-body interface by examining the intertwinement of embodied practices and turns at talk, where the sensing body permeates the ongoing syntax, in particular in activities in which the participants are engaged in talking about sensorial features while at the same time experiencing them, for instance in tasting sessions. So, the question tackled concerns how situated feelings, sensory experiences, and perceptive actions are embedded in the ongoing talk, and how they shape its emergent syntax, possibly affecting its smooth progressivity. The study shows how the choice of specific syntactic formats can be systematically related to the complex ecology of embodied actions, namely to publicly accountable ways of sensing material objects, to ways of showing and addressing an audience, and to visible ways of referring to standard documents normatively defining tasting descriptors. The syntactic formats described and their specific temporal realizations are thus deeply rooted in the local material ecology, in which they not only reproduce a normative model but reflexively express the senses with words and sensuously feel the words.


YMER Digital ◽  
2021 ◽  
Vol 20 (12) ◽  
pp. 504-509
Author(s):  
C. K Nanhey ◽  
◽  
M. K Bhanarkar ◽  
B. M. Sargar ◽  
◽  
...  

Since many years, metal oxide semiconductor has paid too much interest as a gas sensing material by researchers because of wide performance. TiO2 is one of the majority crucial metal oxide which produced better performance in thin film development. Advanced spray pyrolysis system was used to develop thin film. The gas sensing characteristics TiO2 films are evaluated with responses. The gas sensing response, electrical characterization and sensitivity are corporate.


2021 ◽  
Vol 12 (4) ◽  
pp. 045010
Author(s):  
Balaji Rakesh ◽  
Nipun Sharma ◽  
Rupali Nagar ◽  
Vipul Dhongade ◽  
Krishna Daware ◽  
...  

Abstract Sensors function by interacting with an appropriate stimulus, undergo a change in property, which is then diagnosed by making some measurements. For any sensor, the type of interaction between analyte and sensor surface determines its overall performance. This article explores the philosophy in which primary measurements like response curves can hold information on the “type” of interaction occurring between analyte and sensing material. As case study, titanium oxide (TiO2) pellet sensors fabricated by sol-gel growth of TiO2 nanoparticles (as-grown and annealed) are investigated for humidity sensing at room temperature. The sensors display a very fast response in the 0%–30% relative humidity (%RH) range and return to their initial state without applying any external heat treatment. The response curves are analysed in view of adsorption processes guided by Langmuir isotherms. Correlation between sensor microstructure, adsorption processes and response curve is used to build the mechanistic understanding of the sensing process. The results bring out a unique correlation between sensor microstructure, interaction of analyte with sensing material and profile of response curves. Further, the synthesised sensors exhibit a linear response in the 0%–30% RH range making them suitable for low humidity environments like food packaging industry.


2021 ◽  
pp. 131195
Author(s):  
Thi To Nga Phan ◽  
Thi Tra My Dinh ◽  
Minh Duc Nguyen ◽  
Dan Li ◽  
Chi Nhan Phan ◽  
...  

2021 ◽  
pp. 163398
Author(s):  
Xingyu Yao ◽  
Jinbo Zhao ◽  
Jiurong Liu ◽  
Fenglong Wang ◽  
Lili Wu ◽  
...  

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