Two-Dimensional Fractal Structures of Metal Oxides Synthesized at Room Temperature

2008 ◽  
Vol 47-50 ◽  
pp. 1177-1180 ◽  
Author(s):  
Lan Chen ◽  
Ju Xu ◽  
Michael A. Morris
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Surface Coverage ◽  
High Surface ◽  
Two Dimensional ◽  
Colloidal Solutions ◽  
Fractal Structures ◽  
Potential Applications ◽  
Very High ◽  
Catalyst Carriers

2D metal oxide fractal structures with different appearance and composition are successfully grown on the silicon (100) substrates from their colloidal solutions at room temperature. These films display very high surface coverage on the substrates and abundant structures. The results demonstrate the appearances and dimensions of these structures are dependent on the properties and composition of their constituent particles and the substrates. This work may have potential applications in the fabrication of gas sensors, photon-receivers and catalyst carriers which are not easy made by other methods at RT.

MXene/WS2 2D/2D hybrid films for visible-light-activated NO2 sensing at room temperature

2021 ◽  
Author(s):  
Yi Xia ◽  
Sufang He ◽  
Mingjun Wang ◽  
Liexing Zhou ◽  
Jing Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Gas Sensors ◽  
Room Temperature ◽  
2D Materials ◽  
Two Dimensional ◽  
Hybrid Films

OPTOELECTRONIC GAS SENSORS BASED ON TWO-DIMENSIONAL (2D) MATERIALS ARE TOUTED AS POTENTIAL CANDIDATES FOR NO2 SENSING AT ROOM TEMPERATURE. HOWEVER, MOST OF THE DEVELOPED OPTOELECTRONIC SENSORS TO DATE ARE CONFINED...

Effect of current density on the porous silicon preparation as gas sensors**

2021 ◽  
Vol 30 (1) ◽  
pp. 257-264
Author(s):  
Muna H. Kareem ◽  
Adi M. Abdul Hussein ◽  
Haitham Talib Hussein
Keyword(s):  
Porous Silicon ◽  
Gas Sensors ◽  
Current Density ◽  
Room Temperature ◽  
Low Cost ◽  
High Surface ◽  
Volume Ratio ◽  
Etching Time ◽  
Force Microscopy ◽  
Materials Used

Abstract In this study, porous silicon (PSi) was used to manufacture gas sensors for acetone and ethanol. Samples of PSi were successfully prepared by photoelectrochemical etching and applied as an acetone and ethanol gas sensor at room temperature at various current densities J= 12, 24 and 30 mA/cm2 with an etching time of 10 min and hydrofluoric acid concentration of 40%. Well-ordered n-type PSi (100) was carefully studied for its chemical composition, surface structure and bond configuration of the surface via X-ray diffraction, atomic force microscopy, Fourier transform infrared spectroscopy and photoluminescence tests. Results showed that the best sensitivity of PSi was to acetone gas than to ethanol under the same conditions at an etching current density of 30 mA/cm2, reaching about 2.413 at a concentration of 500 parts per million. The PSi layers served as low-cost and high-quality acetone gas sensors. Thus, PSi can be used to replace expensive materials used in gas sensors that function at low temperatures, including room temperature. The material has an exceptionally high surface-to-volume ratio (increasing surface area) and demonstrates ease of fabrication and compatibility with manufacturing processes of silicon microelectronics.

scholarly journals Two-Dimensional NbS2 Gas Sensors for Selective and Reversible NO2 Detection at Room Temperature

ACS Sensors ◽  
2019 ◽  
Vol 4 (9) ◽  
pp. 2395-2402 ◽  
Author(s):  
Yeonhoo Kim ◽  
Ki Chang Kwon ◽  
Sungwoo Kang ◽  
Changyeon Kim ◽  
Tae Hoon Kim ◽  
...  
Keyword(s):  
Gas Sensors ◽  
Room Temperature ◽  
Two Dimensional ◽  
No2 Detection

Two-dimensional MoSe2 nanosheets via liquid-phase exfoliation for high-performance room temperature NO2 gas sensors

2019 ◽  
Vol 30 (44) ◽  
pp. 445503 ◽  
Author(s):  
Xi Chen ◽  
Xinwei Chen ◽  
Yutong Han ◽  
Chen Su ◽  
Min Zeng ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Gas Sensors ◽  
High Performance ◽  
Room Temperature ◽  
Two Dimensional ◽  
Liquid Phase Exfoliation ◽  
No2 Gas Sensors

Electrospraying preparation of metal germanate nanospheres for high-performance lithium-ion batteries and room-temperature gas sensors

Nanoscale ◽  
2019 ◽  
Vol 11 (25) ◽  
pp. 12116-12123 ◽  
Author(s):  
Rui Li ◽  
Renmu Zhang ◽  
Zheng Lou ◽  
Tingting Huang ◽  
Kai Jiang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Gas Sensors ◽  
High Performance ◽  
Large Scale ◽  
Room Temperature ◽  
Lithium Ion ◽  
Ammonia Gas ◽  
Potential Applications ◽  
Ammonia Gas Sensors

Metal germanate nanospheres including Ca2Ge7O16, Zn2GeO4 and SrGe4O9 were prepared by a facile and large-scale electrospraying process. They have potential applications in lithium-ion batteries and room temperature ammonia gas sensors.

2D/2D/2D Ti3C2Tx@TiO2@MoS2 Heterostructure as Ultrafast and High-sensitivity NO2 Gas Sensor at Room-temperature

2022 ◽  
Author(s):  
Zhuo Liu ◽  
He Lv ◽  
Ying Xie ◽  
Jue Wang ◽  
Jiahui Fan ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Room Temperature ◽  
Gas Sensing ◽  
2D Materials ◽  
High Sensitivity ◽  
Two Dimensional ◽  
No2 Gas Sensor ◽  
2D Structure ◽  
Sensing Application

The very diverse two-dimensional (2D) materials have bloomed in NO2 gas sensing application that provide new opportunities and challenges in function oriented gas sensors. In this work, a 2D/2D/2D structure...

Sequential N-Fold (N<4) Electrodeposition of YBa2Cu3O7-δ HTSC Films on Silver Substrates

1998 ◽  
Vol 547 ◽  
Author(s):  
M. S. Martín-Gonzilez ◽  
E. Morán ◽  
R. Sáez-Puche ◽  
M. Á. Alario-Franco
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Surface Coverage ◽  
Oxidation Process ◽  
Deposition Process ◽  
Mechanical Pressure ◽  
Simple Process ◽  
Metallic Substrates ◽  
Surface Covering ◽  
Very High

AbstractElectrodeposition of multimetallic films at room temperature on metallic substrates followed by oxidation at high temperature (~ 900°C) has often been employed to prepare high temperature superconducting (HTSC) films. A difficulty with this otherwise cheap and simple process is that the degree of surface covering is usually not very high. We have attempted to remediate this problem by sequentially repeating the deposition process on the same film. In this way, we have improved quite markedly critical current density (Jc) of films obtained on Silver substrates.To quote some figures, Jc at 1 T is ~ 400 A/cm2 after the first deposition/oxidation process and it increases to ~ 2 000 A/cm2 after the fourth one. The evolution of the morphology of the films has been followed by means of scanning electron microscopy (SEM). It shows that, although the degree of surface coverage never attains 100 %, a substantial proportion of the substrate is well coated.We have also studied the influence of mechanical pressure on the metallic film before the thermal treatment; after the fourth deposition, a pressure of ~15 KBar was applied. In this case a ~ 7% increase in Jc was observed and the density after compression (6.98 g/cm3) attains almost 100 % of the theoretical value for YBa2Cu3O7-δ (Ybacuo).

Coexistence of intrinsic room-temperature ferromagnetism and piezoelectricity in monolayer BiCrX3 (X = S, Se, Te)

2021 ◽  
Author(s):  
Guang Song ◽  
Chengfeng Zhang ◽  
Zhengzhong Zhang ◽  
Guannan Li ◽  
Zhongwen Li ◽  
...  
Keyword(s):  
Room Temperature ◽  
2D Materials ◽  
Room Temperature Ferromagnetism ◽  
Two Dimensional ◽  
Spintronic Devices ◽  
Potential Applications ◽  
Intrinsic Ferromagnetism

Two-dimensional (2D) materials with intrinsic ferromagnetism and piezoelectricity have received growing attention due to their potential applications in nanoscale spintronic devices. However, their applications are highly limited by the low...

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