Because of the interesting and multifunctional properties,recently,ZnO nanostructures are considered as excellent material for fabrication of highly sensitive and selective gas sensors.Thus,ZnO nanomaterials are widel...Because of the interesting and multifunctional properties,recently,ZnO nanostructures are considered as excellent material for fabrication of highly sensitive and selective gas sensors.Thus,ZnO nanomaterials are widely used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases.The presented review article is focusing on the recent developments of NO2gas sensors based on ZnO nanomaterials.The review presents the general introduction of some metal oxide nanomaterials for gas sensing application and finally focusing on the structure of ZnO and its gas sensing mechanisms.Basic gas sensing characteristics such as gas response,response time,recovery time,selectivity,detection limit,stability and recyclability,etc are also discussed in this article.Further,the utilization of various ZnO nanomaterials such as nanorods,nanowires,nano-micro flowers,quantum dots,thin films and nanosheets,etc for the fabrication of NO2gas sensors are also presented.Moreover,various factors such as NO2concentrations,annealing temperature,ZnO morphologies and particle sizes,relative humidity,operating temperatures which are affecting the NO2gas sensing properties are discussed in this review.Finally,the review article is concluded and future directions are presented.展开更多
The ZnO nanostructures have been synthesized and studied as the sensing element for the detection of H2S. The ZnO nanostructures were synthesized by hydrothermal method followed by sonication for different interval of...The ZnO nanostructures have been synthesized and studied as the sensing element for the detection of H2S. The ZnO nanostructures were synthesized by hydrothermal method followed by sonication for different interval of time i.e. 30, 60, 90 and 120 min. By using screen printing method, thick films of synthesized ZnO nanostructure were deposited on glass substrate. Gas sensing properties of ZnO nanostructure thick films were studied for low concentration H2S gas at room temperature. The effects of morphology of synthesized ZnO nanostructure on gas sensing properties were studied and discussed. ZnO nanostructure synthesized by this method can be used as a promising material for semiconductor gas sensor to detect poisonous gas like H2S at room temperature with high sensitivity and selectivity.展开更多
ZnO nanostructures were prepared on corning glass substrate by flow coating process with different annealing temperature from 100?C to 600?C. Fresh and two days aged solutions were used to investigate the growth behav...ZnO nanostructures were prepared on corning glass substrate by flow coating process with different annealing temperature from 100?C to 600?C. Fresh and two days aged solutions were used to investigate the growth behavior and to evaluate the nanostructure of ZnO. The effect of preparation conditions on the deposition of ZnO nanostructure was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman, and photoluminescence spectroscopy (PL). The results indicated that the solution aging condition and annealing temperature have a strong influence on the morphology and structural properties of the ZnO nanostructure. The solution aged after two days shows the different morphologies compared with the freshly prepared solution.展开更多
ZnO作为一种典型的透明导电氧化物(Transparent conductive oxide,TCO)材料,具有同氧化铟锡(Indium tin oxide,ITO)相比拟的光电性能,其原料丰富、绿色环保、易于制备、生成成本低等优点使ZnO成为最有希望替代ITO的材料。本文以玻璃为衬...ZnO作为一种典型的透明导电氧化物(Transparent conductive oxide,TCO)材料,具有同氧化铟锡(Indium tin oxide,ITO)相比拟的光电性能,其原料丰富、绿色环保、易于制备、生成成本低等优点使ZnO成为最有希望替代ITO的材料。本文以玻璃为衬底,利用量子点种子层作为缓冲层,采用传统水热方法制备了低成本ZnO透明导电薄膜,采用特殊的紫外光辐照工艺对薄膜进行后处理,探索薄膜生长参数和紫外光辐照处理工艺对其透光率和导电性的影响。结果表明,紫外辐照处理不影响薄膜的透光性能,而使材料的方块电阻降低3个数量级,数值从没处理时的1.5×105Ω/□降低到150Ω/□,极大地提高了薄膜的电导率,为ZnO薄膜材料电导率的提高提供了一个简单高效的途径。展开更多
基金supported by NSTIP strategic technologies programs,number(12-NAN2551-02)in the Kingdom of Saudi Arabia
文摘Because of the interesting and multifunctional properties,recently,ZnO nanostructures are considered as excellent material for fabrication of highly sensitive and selective gas sensors.Thus,ZnO nanomaterials are widely used to fabricate efficient gas sensors for the detection of various hazardous and toxic gases.The presented review article is focusing on the recent developments of NO2gas sensors based on ZnO nanomaterials.The review presents the general introduction of some metal oxide nanomaterials for gas sensing application and finally focusing on the structure of ZnO and its gas sensing mechanisms.Basic gas sensing characteristics such as gas response,response time,recovery time,selectivity,detection limit,stability and recyclability,etc are also discussed in this article.Further,the utilization of various ZnO nanomaterials such as nanorods,nanowires,nano-micro flowers,quantum dots,thin films and nanosheets,etc for the fabrication of NO2gas sensors are also presented.Moreover,various factors such as NO2concentrations,annealing temperature,ZnO morphologies and particle sizes,relative humidity,operating temperatures which are affecting the NO2gas sensing properties are discussed in this review.Finally,the review article is concluded and future directions are presented.
文摘The ZnO nanostructures have been synthesized and studied as the sensing element for the detection of H2S. The ZnO nanostructures were synthesized by hydrothermal method followed by sonication for different interval of time i.e. 30, 60, 90 and 120 min. By using screen printing method, thick films of synthesized ZnO nanostructure were deposited on glass substrate. Gas sensing properties of ZnO nanostructure thick films were studied for low concentration H2S gas at room temperature. The effects of morphology of synthesized ZnO nanostructure on gas sensing properties were studied and discussed. ZnO nanostructure synthesized by this method can be used as a promising material for semiconductor gas sensor to detect poisonous gas like H2S at room temperature with high sensitivity and selectivity.
文摘ZnO nanostructures were prepared on corning glass substrate by flow coating process with different annealing temperature from 100?C to 600?C. Fresh and two days aged solutions were used to investigate the growth behavior and to evaluate the nanostructure of ZnO. The effect of preparation conditions on the deposition of ZnO nanostructure was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman, and photoluminescence spectroscopy (PL). The results indicated that the solution aging condition and annealing temperature have a strong influence on the morphology and structural properties of the ZnO nanostructure. The solution aged after two days shows the different morphologies compared with the freshly prepared solution.
文摘ZnO作为一种典型的透明导电氧化物(Transparent conductive oxide,TCO)材料,具有同氧化铟锡(Indium tin oxide,ITO)相比拟的光电性能,其原料丰富、绿色环保、易于制备、生成成本低等优点使ZnO成为最有希望替代ITO的材料。本文以玻璃为衬底,利用量子点种子层作为缓冲层,采用传统水热方法制备了低成本ZnO透明导电薄膜,采用特殊的紫外光辐照工艺对薄膜进行后处理,探索薄膜生长参数和紫外光辐照处理工艺对其透光率和导电性的影响。结果表明,紫外辐照处理不影响薄膜的透光性能,而使材料的方块电阻降低3个数量级,数值从没处理时的1.5×105Ω/□降低到150Ω/□,极大地提高了薄膜的电导率,为ZnO薄膜材料电导率的提高提供了一个简单高效的途径。
