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Preparation of NiO two-dimensional grainy films and their high-performance gas sensors for ammonia detection.

Wang J, Yang P, Wei X, Zhou Z - Nanoscale Res Lett (2015)

Bottom Line: The morphology and structure analysis of gas sensing materials indicated that the as-fabricated NiO films was uniform and highly ordered porous structure on substrates, which composed of small size particles with diameters ranging from 8 to 30 nm.In the gas sensing performance tests, we found that the excellent electron transport and interconnection properties of sensing films improved the stability and recovery performance of sensors, and porous surface structure increased the specific surface area of sensing films leading to fast response and excellent sensitivity for sensors.Meanwhile, this sensors owned outstanding selectivity toward ammonia which could be because NiO-sensing films had higher binding affinity for the electron-donating ammonia.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, Xihua University, Chengdu, 610039 People's Republic of China.

ABSTRACT
Semiconductor NiO two-dimensional grainy films on glass substrates are shown to be an ammonia-sensing devices with excellent comprehensive performance, such as the good stability, short response time, outstanding recovery performance, excellent sensitivity, and selectivity. The morphology and structure analysis of gas sensing materials indicated that the as-fabricated NiO films was uniform and highly ordered porous structure on substrates, which composed of small size particles with diameters ranging from 8 to 30 nm. The shells of these particles were ultrathin amorphous NiO plates, and the core of each particle was face-centered cubic single crystal structure. In the gas sensing performance tests, we found that the excellent electron transport and interconnection properties of sensing films improved the stability and recovery performance of sensors, and porous surface structure increased the specific surface area of sensing films leading to fast response and excellent sensitivity for sensors. Meanwhile, this sensors owned outstanding selectivity toward ammonia which could be because NiO-sensing films had higher binding affinity for the electron-donating ammonia.

No MeSH data available.


Related in: MedlinePlus

Fabricating flowchart of the gas sensing materials and gas sensors.(A1-A4) Flowchart of gas sensing films fabrication shows the specific procedures of synthesis of NiO films on glass substrates. This unique film structure was fabricated via a chemical controllable reaction combined with high-temperature oxidation approach. (B1-B3) Flowchart shows the assemble processes and configuration of the gas sensing devices based as-prepared NiO films, which mainly contained the preparation of electrodes and the connection between NiO sensing materials and electrodes.
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Fig1: Fabricating flowchart of the gas sensing materials and gas sensors.(A1-A4) Flowchart of gas sensing films fabrication shows the specific procedures of synthesis of NiO films on glass substrates. This unique film structure was fabricated via a chemical controllable reaction combined with high-temperature oxidation approach. (B1-B3) Flowchart shows the assemble processes and configuration of the gas sensing devices based as-prepared NiO films, which mainly contained the preparation of electrodes and the connection between NiO sensing materials and electrodes.

Mentions: The specific strategies to fabricate the NiO films on glass substrates, where the thickness of glass was around 2 mm, were summarized as follows. Initially, a certain amount of NiCl2 · 6H2O was dissolved into 50 mL distilled water and was continuous stirred at room temperature for 30 min to yield a grass-green transparent and homogeneously solution. Then, 50 mL aqueous solution of NaOH and 25 mL aqueous solution of N2H4 · 6H2O were added dropwise into the above as-prepared solution. This reaction mixture was stirred constantly for an hour to ensure that the anions and cation were dispersed homogeneously in the solution, and the color of solution changed from grass-green to navy blue color. In the meantime, the glass substrates were ultrasonically washed two times with ethanol and distilled water for 15 min, respectively. At this point, as-prepared reaction mixture was transferred into a flask containing as-treated glass substrate and subsequently heated to 80°C at atmospheric pressure. After the reaction was completed, the resulting Ni film covering of the glass substrate was washed two times using ethanol and distilled water, respectively, and then, the samples were heated to 450°C for 6 h in open air. The resultant gray-green products on the glass substrate were NiO films. Figure 1 A1-A4 shows the flowchart of fabrication of the NiO films on glass substrates, which used as gas sensing materials.Figure 1


Preparation of NiO two-dimensional grainy films and their high-performance gas sensors for ammonia detection.

Wang J, Yang P, Wei X, Zhou Z - Nanoscale Res Lett (2015)

Fabricating flowchart of the gas sensing materials and gas sensors.(A1-A4) Flowchart of gas sensing films fabrication shows the specific procedures of synthesis of NiO films on glass substrates. This unique film structure was fabricated via a chemical controllable reaction combined with high-temperature oxidation approach. (B1-B3) Flowchart shows the assemble processes and configuration of the gas sensing devices based as-prepared NiO films, which mainly contained the preparation of electrodes and the connection between NiO sensing materials and electrodes.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385235&req=5

Fig1: Fabricating flowchart of the gas sensing materials and gas sensors.(A1-A4) Flowchart of gas sensing films fabrication shows the specific procedures of synthesis of NiO films on glass substrates. This unique film structure was fabricated via a chemical controllable reaction combined with high-temperature oxidation approach. (B1-B3) Flowchart shows the assemble processes and configuration of the gas sensing devices based as-prepared NiO films, which mainly contained the preparation of electrodes and the connection between NiO sensing materials and electrodes.
Mentions: The specific strategies to fabricate the NiO films on glass substrates, where the thickness of glass was around 2 mm, were summarized as follows. Initially, a certain amount of NiCl2 · 6H2O was dissolved into 50 mL distilled water and was continuous stirred at room temperature for 30 min to yield a grass-green transparent and homogeneously solution. Then, 50 mL aqueous solution of NaOH and 25 mL aqueous solution of N2H4 · 6H2O were added dropwise into the above as-prepared solution. This reaction mixture was stirred constantly for an hour to ensure that the anions and cation were dispersed homogeneously in the solution, and the color of solution changed from grass-green to navy blue color. In the meantime, the glass substrates were ultrasonically washed two times with ethanol and distilled water for 15 min, respectively. At this point, as-prepared reaction mixture was transferred into a flask containing as-treated glass substrate and subsequently heated to 80°C at atmospheric pressure. After the reaction was completed, the resulting Ni film covering of the glass substrate was washed two times using ethanol and distilled water, respectively, and then, the samples were heated to 450°C for 6 h in open air. The resultant gray-green products on the glass substrate were NiO films. Figure 1 A1-A4 shows the flowchart of fabrication of the NiO films on glass substrates, which used as gas sensing materials.Figure 1

Bottom Line: The morphology and structure analysis of gas sensing materials indicated that the as-fabricated NiO films was uniform and highly ordered porous structure on substrates, which composed of small size particles with diameters ranging from 8 to 30 nm.In the gas sensing performance tests, we found that the excellent electron transport and interconnection properties of sensing films improved the stability and recovery performance of sensors, and porous surface structure increased the specific surface area of sensing films leading to fast response and excellent sensitivity for sensors.Meanwhile, this sensors owned outstanding selectivity toward ammonia which could be because NiO-sensing films had higher binding affinity for the electron-donating ammonia.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, Xihua University, Chengdu, 610039 People's Republic of China.

ABSTRACT
Semiconductor NiO two-dimensional grainy films on glass substrates are shown to be an ammonia-sensing devices with excellent comprehensive performance, such as the good stability, short response time, outstanding recovery performance, excellent sensitivity, and selectivity. The morphology and structure analysis of gas sensing materials indicated that the as-fabricated NiO films was uniform and highly ordered porous structure on substrates, which composed of small size particles with diameters ranging from 8 to 30 nm. The shells of these particles were ultrathin amorphous NiO plates, and the core of each particle was face-centered cubic single crystal structure. In the gas sensing performance tests, we found that the excellent electron transport and interconnection properties of sensing films improved the stability and recovery performance of sensors, and porous surface structure increased the specific surface area of sensing films leading to fast response and excellent sensitivity for sensors. Meanwhile, this sensors owned outstanding selectivity toward ammonia which could be because NiO-sensing films had higher binding affinity for the electron-donating ammonia.

No MeSH data available.


Related in: MedlinePlus