Lasing Mechanism of ZnO Nanowires/Nanobelts at Room Temperature

Metal-semiconductor junctions and interfaces have been studied for many years due to their importance in applications such as semiconductor electronics and solar cells. However, semiconductor-metal networks are less studied because there is a lack of effective methods to fabricate such structures. Here, we report a novel Au–ZnO-based metal-semiconductor (M-S)n network in which ZnO nanowires were grown horizontally on gold particles and extended to reach the neighboring particles, forming an (M-S)n network. The (M-S)n network was further used as a gas sensor for sensing ethanol and acetone gases. The results show that the (M-S)n network is sensitive to ethanol (28.1 ppm) and acetone (22.3 ppm) gases and has the capacity to recognize the two gases based on differences in the saturation time. This study provides a method for producing a new type of metal-semiconductor network structure and demonstrates its application in gas sensing.

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2D SnSe2 Nanoflakes Decorated with 1D ZnO Nanowires for ppb-Level NO2 Detection at Room Temperature

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.128061 ◽

2021 ◽

pp. 128061

Author(s):

Xuezheng Guo ◽

Yanqiao Ding ◽

Xi Yang ◽

Bingsheng Du ◽

Chengjiu Zhao ◽

...

Keyword(s):

Room Temperature ◽

Zno Nanowires ◽

No2 Detection

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Room temperature H2S sensor based on Au modified ZnO nanowires

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2013.06.070 ◽

2013 ◽

Vol 186 ◽

pp. 718-726 ◽

Cited By ~ 126

Author(s):

Niranjan S. Ramgir ◽

Preetam K. Sharma ◽

N. Datta ◽

M. Kaur ◽

A.K. Debnath ◽

...

Keyword(s):

Room Temperature ◽

Zno Nanowires

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Molecular Beam Epitaxy of Znl-x Cdx Se/ZnSe Heterostructures And Their Optical Properties

MRS Proceedings ◽

10.1557/proc-228-301 ◽

1991 ◽

Vol 228 ◽

Cited By ~ 5

Author(s):

H. Luo ◽

N. Samarth ◽

J. K. Furdyna ◽

H. Jeon ◽

J. Ding ◽

...

Keyword(s):

Optical Properties ◽

Molecular Beam Epitaxy ◽

Quantum Wells ◽

Room Temperature ◽

Molecular Beam ◽

Stimulated Emission ◽

Optically Pumped ◽

Absorption Coefficients ◽

Excitonic Absorption ◽

Lasing Mechanism

ABSTRACTSuperlattices and quantum wells of Znl-xCdxSe/ZnSe, and heterostructures based on ZnSe/CdSe digital alloys have been grown by molecular beam epitaxy (MBE). Their optical properties were studied with particular emphasis on excitonic absorption and photopumped stimulated emission. Excitonic absorption is easily observable up to 400 K, and is characterized by extremely large absorption coefficients (α = 2×105cm−1). Optically pumped lasing action is obtained at room temperature with a typical threshold intensity of 100 kW/cm2. The lasing mechanism in these II-VI quantum wells appears to be quite different from that in the better studied III-V materials: in our case, the onset of stimulated emission occurs before the saturation of the excitonic absorption, and the stimulated emission occurs at an energy lower than that of the excitonic absorption.

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