The range of antiferromagnetic coupling governs the conductivity: semiconducting behavior and ammonia gas sensing property of diamagnetic hexaradical-containing tetranuclear CoIII4 cluster and its nonradical congener

2020 ◽  
Vol 56 (96) ◽  
pp. 15220-15223
Author(s):  
Prasenjit Sarkar ◽  
Tukhar Jyoti Konch ◽  
Tapas Kamilya ◽  
Kalyan Raidongia ◽  
Somobrata Acharya ◽  
...  
Keyword(s):  
Long Range ◽  
Room Temperature ◽  
Gas Sensing ◽  
Electron Flow ◽  
Antiferromagnetic Coupling ◽  
Ammonia Gas ◽  
Flow Through ◽  
Paramagnetic Centres ◽  
Semiconducting Behavior

The long-range antiferromagnetic coupling impedes electron flow through hexaradical-containing tetranuclear CoIII4 complex (1), while nonradical-containing tetranuclear CoIII4 complex (2), with no paramagnetic centres, is a semiconductor and sensed NH3 efficiently at room temperature (25 °C).

scholarly journals Three-dimensional platinum nanoparticle-based bridges for ammonia gas sensing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nishchay A. Isaac ◽  
Johannes Reiprich ◽  
Leslie Schlag ◽  
Pedro H. O. Moreira ◽  
Mostafa Baloochi ◽  
...  
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Response Times ◽  
High Surface ◽  
Three Dimensional ◽  
Performance Testing ◽  
Volume Ratio ◽  
Platinum Nanoparticle ◽  
Ammonia Gas ◽  
Lift Off

AbstractThis study demonstrates the fabrication of self-aligning three-dimensional (3D) platinum bridges for ammonia gas sensing using gas-phase electrodeposition. This deposition scheme can guide charged nanoparticles to predetermined locations on a surface with sub-micrometer resolution. A shutter-free deposition is possible, preventing the use of additional steps for lift-off and improving material yield. This method uses a spark discharge-based platinum nanoparticle source in combination with sequentially biased surface electrodes and charged photoresist patterns on a glass substrate. In this way, the parallel growth of multiple sensing nodes, in this case 3D self-aligning nanoparticle-based bridges, is accomplished. An array containing 360 locally grown bridges made out of 5 nm platinum nanoparticles is fabricated. The high surface-to-volume ratio of the 3D bridge morphology enables fast response and room temperature operated sensing capabilities. The bridges are preconditioned for ~ 24 h in nitrogen gas before being used for performance testing, ensuring drift-free sensor performance. In this study, platinum bridges are demonstrated to detect ammonia (NH3) with concentrations between 1400 and 100 ppm. The sensing mechanism, response times, cross-sensitivity, selectivity, and sensor stability are discussed. The device showed a sensor response of ~ 4% at 100 ppm NH3 with a 70% response time of 8 min at room temperature.

Novel Zinc-Based Infinite Coordination Polymer for Highly Selective Ammonia Gas Sensing at Room Temperature

2020 ◽  
Vol 93 (9) ◽  
pp. 1070-1073
Author(s):  
Yuming Zhao ◽  
Lei Shao ◽  
Linlin Li ◽  
Sha Wang ◽  
Guoshuai Song ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas

scholarly journals Ammonia Gas Detection by Tannic Acid Functionalized and Reduced Graphene Oxide at Room Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Sweejiang Yoo ◽  
Xin Li ◽  
Yuan Wu ◽  
Weihua Liu ◽  
Xiaoli Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Gas Sensor ◽  
Tannic Acid ◽  
Room Temperature ◽  
Gas Sensing ◽  
High Sensitivity ◽  
Gas Detection ◽  
Ammonia Gas ◽  
Reduced Graphene

Reduced graphene oxide (rGO) based chemiresistor gas sensor has received much attention in gas sensing for high sensitivity, room temperature operation, and reversible. Here, for the first time, we present a promising chemiresistor for ammonia gas detection based on tannic acid (TA) functionalized and reduced graphene oxide (rGOTA functionalized). Green reductant of TA plays a major role in both reducing process and enhancing the gas sensing properties ofrGOTA functionalized. Our results showrGOTA functionalizedonly selective to ammonia with excellent respond, recovery, respond time, and recovery times.rGOTA functionalizedelectrical resistance decreases upon exposure to NH3where we postulated that it is due to n-doping by TA and charge transfer betweenrGOTA functionalizedand NH3through hydrogen bonding. Furthermore,rGOTA functionalizedhinders the needs for stimulus for both recovery and respond. The combination of greener sensing material and simplicity in overall sensor design provides a new sight for green reductant approach of rGO based chemiresistor gas sensor.

Amorphous covalent triazine frameworks for high performance room temperature ammonia gas sensing

2014 ◽  
Vol 38 (7) ◽  
pp. 2774 ◽  
Author(s):  
Li-Ming Tao ◽  
Fang Niu ◽  
Di Zhang ◽  
Ting-Mei Wang ◽  
Qi-Hua Wang
Keyword(s):  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas

Room temperature ammonia gas sensing properties of polyaniline nanofibers

2019 ◽  
Vol 30 (9) ◽  
pp. 8371-8380 ◽  
Author(s):  
S. B. Kulkarni ◽  
Y. H. Navale ◽  
S. T. Navale ◽  
F. J. Stadler ◽  
V. B. Patil
Keyword(s):  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Sensing Properties ◽  
Polyaniline Nanofibers ◽  
Gas Sensing Properties

2D WS2 nanosheets with TiO2 quantum dots decoration for high-performance ammonia gas sensing at room temperature

2017 ◽  
Vol 253 ◽  
pp. 1034-1042 ◽  
Author(s):  
Ziyu Qin ◽  
Chao Ouyang ◽  
Jian Zhang ◽  
Li Wan ◽  
Shimin Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Performance ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Ws2 Nanosheets

Room Temperature Ammonia Gas Sensing Properties of Biosynthesized tin Oxide Nanoparticle Thin Films

2015 ◽  
Vol 11 (2) ◽  
pp. 253-260 ◽  
Author(s):  
Ketan Gattu ◽  
Kalyani Ghule ◽  
Anil Kashale ◽  
R.S. Mane ◽  
Ramphal Sharma ◽  
...  
Keyword(s):  
Thin Films ◽  
Tin Oxide ◽  
Room Temperature ◽  
Gas Sensing ◽  
Ammonia Gas ◽  
Sensing Properties ◽  
Gas Sensing Properties ◽  
Oxide Nanoparticle

sbRIO Lab–On–Chip Gas Sensing and Monitoring for Multisensory Array

2013 ◽  
Vol 61 (2) ◽  
Author(s):  
Siti Noradhlia Mohamad Tukijan ◽  
Mohd Azhar Abdul Razak ◽  
Fauzan Khairi Che Harun
Keyword(s):  
Response Time ◽  
Real Time ◽  
Virtual Instrument ◽  
Room Temperature ◽  
Gas Sensing ◽  
Fast Response ◽  
Lab On Chip ◽  
Flow Through ◽  
On Chip ◽  
Early Preparation

It is utmost to create a system at which can monitor and indicate the gas level exist in certain area, especially for hazardous gas, as early preparation and protection before something worst happen. The gas sensing and monitoring system composes of hardware and software elements. A spiral chamber which is simplified on chip, known as Lab–On–Chip (LOC), plays an important role in this system. The examined gases will be analysed by 16 sensors during the flow through the spiral chamber. The responses of these sensors are obtained via analogue input channels from single board RIO (sbRIO) and are displayed on a computer using LabVIEW virtual instrument software. The system offers portable, real–time monitoring and fast response time even in room temperature.

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