Fabrication of highly responsive room temperature H2 sensor based on vertically aligned edge-oriented MoS2 nanostructured thin film functionalized by Pd nanoparticles

The stabilization of black-phase formamidinium lead iodide (α-FAPbI3) perovskite under various environmental conditions is considered necessary for solar cells. However, challenges remain regarding the temperature sensitivity of α-FAPbI3 and the requirements for strict humidity control in its processing. Here we report the synthesis of stable α-FAPbI3, regardless of humidity and temperature, based on a vertically aligned lead iodide thin film grown from an ionic liquid, methylamine formate. The vertically grown structure has numerous nanometer-scale ion channels that facilitate the permeation of formamidinium iodide into the lead iodide thin films for fast and robust transformation to α-FAPbI3. A solar cell with a power-conversion efficiency of 24.1% was achieved. The unencapsulated cells retain 80 and 90% of their initial efficiencies for 500 hours at 85°C and continuous light stress, respectively.

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Preparation and Characterization of Pd-Based Optical Hydrogen Sensor Operated at Room Temperature by Using Photodeposition Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.445.100 ◽

2010 ◽

Vol 445 ◽

pp. 100-104 ◽

Cited By ~ 2

Author(s):

Junichi Hamagami ◽

Ryo Araki ◽

Hiroyuki Oda ◽

Mototsugu Sakai ◽

Atsunori Matsuda

Keyword(s):

Thin Film ◽

Glass Substrate ◽

Room Temperature ◽

Tio2 Thin Film ◽

Uv Light ◽

Sol Gel ◽

Optical Transmittance ◽

Pd Nanoparticles ◽

Hydrogen Gas ◽

Hot Water

Palladium (Pd) nanoparticles were prepared on photocatalytic TiO2-coated glass substrate by a photodeposition process and the optical hydrogen sensing properties were examined at room temperature. The TiO2 coatings were prepared on a non-alkaline glass substrate by a sol-gel process and hot water treatment. Pd nanoparticles were deposited on the TiO2 film by photodeposition using UV light. The obtained Pd/TiO2 thin film showed remarkable optical transmittance response to hydrogen gas at room temperature. The normalized transmittance of the Pd/TiO2 thin film at a wavelength of 640 nm decreased to 0.9 on exposing the film to hydrogen gas for only 5 s. This transmittance decrease is considered to be due to a gaschromic effect of the TiO2 photocatalytic coating.

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Room temperature ammonia gas sensing properties of MoS2 nanostructured thin film

10.1063/1.5032596 ◽

2018 ◽

Cited By ~ 7

Author(s):

Shubham Sharma ◽

Arvind Kumar ◽

Davinder Kaur

Keyword(s):

Thin Film ◽

Room Temperature ◽

Gas Sensing ◽

Ammonia Gas ◽

Sensing Properties ◽

Nanostructured Thin Film ◽

Gas Sensing Properties

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Selective room temperature nanostructured thin film alcohol sensor as a virtual sensor array

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2012.09.041 ◽

2013 ◽

Vol 176 ◽

pp. 1096-1102 ◽

Cited By ~ 23

Author(s):

N.A. Beckers ◽

M.T. Taschuk ◽

M.J. Brett

Keyword(s):

Thin Film ◽

Room Temperature ◽

Sensor Array ◽

Virtual Sensor ◽

Nanostructured Thin Film ◽

Alcohol Sensor

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Connected AZO Nanorods for Sensitivity Enhancement of Chemical Sensors at Room Temperature

10.20944/preprints201808.0252.v1 ◽

2018 ◽

Author(s):

Dinesh Kumar ◽

Zingway Pei

Keyword(s):

Thin Film ◽

Chemical Sensors ◽

Room Temperature ◽

High Surface ◽

Hydrothermal Process ◽

High Surface Area ◽

Solution Process ◽

Xps Characterization ◽

High Layer ◽

Vertically Aligned

In this work, the vertically aligned, high conductive Al-doped ZnO nanorod thin film was prepared by multi-layers grown method in solution process .This method of connected nanorod structure is unique of its kind compared with existing hydrothermal process for preparing nanorod. The diameter of AZO nanorod is around 14~16nm with [002] preferred orientation. The Hall measurement indicates the AZO nanorod exhibits high layer conductivity of 280 S/cm. The XPS characterization indicates that the AZO nanorod annealed in forming gas contain high percentage of non-binding oxygens that is suitable for sensor application. The sensing performances of the synthesized nanorod thin film towards the detection of oxidizing agents were analyzed by the current (I)–voltage (V) characteristics in room temperature. With high surface area, the AZO shows sensitivity of 72%, 1660%, and 4.34 x106 % for H2O2, ethanolamine and acetic acid, respectively. 1.02 μM (S/N=3) is the detection limit with broad range of 0.015mM to 29mM is demonstrated for sensing H2O2.

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Studies on Water in the Hydration Chamber of a Modified Electron Microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100069715 ◽

1970 ◽

Vol 28 ◽

pp. 544-545

Author(s):

R. C. Moretz ◽

G. G. Hausner ◽

D. F. Parsons

Keyword(s):

Thin Film ◽

Thin Films ◽

Electron Microscope ◽

Steady State ◽

Room Temperature ◽

Small Mass ◽

Equilibrium Pressure ◽

Biological Objects ◽

Mechanical Pump ◽

Differential Pumping

Use of the electron microscope to examine wet objects is possible due to the small mass thickness of the equilibrium pressure of water vapor at room temperature. Previous attempts to examine hydrated biological objects and water itself used a chamber consisting of two small apertures sealed by two thin films. Extensive work in our laboratory showed that such films have an 80% failure rate when wet. Using the principle of differential pumping of the microscope column, we can use open apertures in place of thin film windows.Fig. 1 shows the modified Siemens la specimen chamber with the connections to the water supply and the auxiliary pumping station. A mechanical pump is connected to the vapor supply via a 100μ aperture to maintain steady-state conditions.

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Warm and freeze-fracture of cotton seed radicles

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100129206 ◽

1987 ◽

Vol 45 ◽

pp. 984-985

Author(s):

E. L. Vigil ◽

E. F. Erbe

Keyword(s):

Thin Film ◽

Water Vapor ◽

Fracture Surface ◽

Membrane Structure ◽

Room Temperature ◽

Freeze Fracture ◽

Longitudinal Axis ◽

Fracture Plane ◽

Cotton Seeds ◽

Condensed Water

In cotton seeds the radicle has 12% moisture content which makes it possible to prepare freeze-fracture replicas without fixation or cryoprotection. For this study we have examined replicas of unfixed radicle tissue fractured at room temperature to obtain data on organelle and membrane structure.Excised radicles from seeds of cotton (Gossyplum hirsutum L. M-8) were fractured at room temperature along the longitudinal axis. The fracture was initiated by spliting the basal end of the excised radicle with a razor. This procedure produced a fracture through the tissue along an unknown fracture plane. The warm fractured radicle halves were placed on a thin film of 100% glycerol on a flat brass cap with fracture surface up. The cap was rapidly plunged into liquid nitrogen and transferred to a freeze- etch unit. The sample was etched for 3 min at -95°C to remove any condensed water vapor and then cooled to -150°C for platinum/carbon evaporation.

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