scholarly journals A Simple Graphene NH3 Gas Sensor via Laser Direct Writing

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4405 ◽  
Author(s):  
Dezhi Wu ◽  
Qianqian Peng ◽  
Shan Wu ◽  
Guangshun Wang ◽  
Lei Deng ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Heating Temperature ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Sensing Element ◽  
Ammonia Gas ◽  
3D Graphene ◽  
Ammonia Sensing ◽  
Response And Recovery ◽  
Ammonia Gas Sensors

Ammonia gas sensors are very essential in many industries and everyday life. However, their complicated fabrication process, severe environmental fabrication requirements and desorption of residual ammonia molecules result in high cost and hinder their market acceptance. Here, laser direct writing is used to fabricate three parallel porous 3D graphene lines on a polyimide (PI) tape to simply construct an ammonia gas sensor. The middle one works as an ammonia sensing element and the other two on both sides work as heaters to improve the desorption performance of the sensing element to ammonia gas molecules. The graphene lines were characterized by scanning electron microscopy and Raman spectroscopy. The response and recovery time of the sensor without heating are 214 s and 222 s with a sensitivity of 0.087% ppm−1 for sensing 75 ppm ammonia gas, respectively. The experimental results prove that under the optimized heating temperature of about 70 °C the heaters successfully help implement complete desorption of residual NH3 showing a good sensitivity and cyclic stability.

Metal-oxide based ammonia gas sensors: A review

2020 ◽  
Vol 10 ◽  
Author(s):  
Priya Gupta ◽  
Savita Maurya ◽  
Narendra Kumar Pandey ◽  
Vernica Verma
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Gas Sensor ◽  
Gas Sensors ◽  
Review Paper ◽  
Gas Sensing ◽  
Gas Sensitivity ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Ammonia Gas Sensors

: This review paper encompasses a study of metal-oxide and their composite based gas sensors used for the detection of ammonia (NH3) gas. Metal-oxide has come into view as an encouraging choice in the gas sensor industry. This review paper focuses on the ammonia sensing principle of the metal oxides. It also includes various approaches adopted for increasing the gas sensitivity of metal-oxide sensors. Increasing the sensitivity of the ammonia gas sensor includes size effects and doping by metal or other metal oxides which will change the microstructure and morphology of the metal oxides. Different parameters that affect the performances like sensitivity, stability, and selectivity of gas sensors are discussed in this paper. Performances of the most operated metal oxides with strengths and limitations in ammonia gas sensing application are reviewed. The challenges for the development of high sensitive and selective ammonia gas sensor are also discussed.

scholarly journals Study of Two Vanadium Based Materials as Working Electrode for Developing A Selective Mixed-Potential Ammonia Sensor

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 770
Author(s):  
Gita Nematbakhsh Abkenar ◽  
Jean-Paul Viricelle ◽  
Mathilde Rieu ◽  
Philippe Breuil
Keyword(s):  
Reference Electrode ◽  
High Sensitivity ◽  
Fast Response ◽  
Mixed Potential ◽  
Ammonia Sensor ◽  
Ammonia Gas ◽  
Recovery Times ◽  
Response And Recovery ◽  
Increasing Temperature ◽  
Ammonia Gas Sensors

Mixed potential ammonia gas sensors were fabricated by using two sensing materials of Ni3V2O8 and Au-V2O5 as working electrodes, YSZ as electrolyte and platinum as reference electrode. The results have shown that the Ni3V2O8 sensors show cross-sensitivity toward NO gas. However, Au-V2O5 working electrodes displayed a high sensitivity to NH3 as well as fast response and recovery times at high temperatures. Furthermore, the results indicate that the selectivity of Au-V2O5 sensors increases by increasing temperature.

ZnO Nanorods Based Ammonia Gas Sensors with Interdigitized Electrodes

2011 ◽  
Vol 694 ◽  
pp. 155-159
Author(s):  
Tai You Chen ◽  
Jian Sheng Wu ◽  
Chi Shiang Hsu ◽  
Po Cheng Chou ◽  
Huey Ing Chen ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Gas Sensors ◽  
High Performance ◽  
Zno Nanorods ◽  
Sensor Response ◽  
Electrode Spacing ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Sensing Applications ◽  
Ammonia Gas Sensors

The ZnO nanorods-based ammonia (NH3) gas sensors with different electrode spacing are fabricated and studied. Experimentally, the hexagonal ZnO nanorods were prepared by a hydrothermal method. The diameter and length of ZnO nanorods were about 179±2, 1806±5 nm, respectively. By shrinking the electrode spacing, the sensor response of studied device is improved and the sensor response is enhanced more than ten times in magnitude. The improved NH3 sensing ability caused by shrink electrode spacing is attributed to the presence of more grain boundaries and depletion layers. Therefore, the studied device with the shrink of electrode spacing provides a promise for high-performance ammonia sensing applications.

scholarly journals The effects of amino substituents on the enhanced ammonia sensing performance of PcCo/rGO hybrids

RSC Advances ◽  
2018 ◽  
Vol 8 (72) ◽  
pp. 41280-41287 ◽  
Author(s):  
Bin Wang ◽  
Xiaolin Wang ◽  
Xiaocheng Li ◽  
Zhijiang Guo ◽  
Xin Zhou ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Ammonia Gas ◽  
Ammonia Sensing ◽  
Highly Sensitive ◽  
Cost Efficient ◽  
Ammonia Gas Sensors ◽  
Sensing Performance

Three new room temperature reversible ammonia gas sensors were fabricated using PcCo/rGO hybrids with cost-efficient, highly sensitive and stable sensing performance.

Nanoparticle cluster gas sensor: Pt activated SnO2 nanoparticles for NH3 detection with ultrahigh sensitivity

Nanoscale ◽  
2015 ◽  
Vol 7 (36) ◽  
pp. 14872-14880 ◽  
Author(s):  
Xu Liu ◽  
Nan Chen ◽  
Bingqian Han ◽  
Xuechun Xiao ◽  
Gang Chen ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Solvothermal Method ◽  
Sno2 Nanoparticles ◽  
Ammonia Gas ◽  
Highly Sensitive ◽  
Nanoparticle Clusters ◽  
Ultrahigh Sensitivity ◽  
Ammonia Gas Sensors ◽  
Nanoparticle Cluster

Pt activated SnO2 nanoparticle clusters were synthesized by a simple solvothermal method for use in highly sensitive ammonia gas sensors.

Wavelength tunable fiber Bragg gratings fabricated by stress annealing assisted femtosecond laser direct writing

2021 ◽  
Vol 61 ◽  
pp. 102427
Author(s):  
Xiaoyan Sun ◽  
Zikun Chang ◽  
Li Zeng ◽  
Xinran Dong ◽  
Youwang Hu ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Wavelength Tunable
Sign in / Sign up

Export Citation Format

Share Document