scholarly journals Influence of electrospray deposition on C60 molecular assemblies

2021 ◽  
Vol 12 ◽  
pp. 552-558
Author(s):  
Antoine Hinaut ◽  
Sebastian Scherb ◽  
Sara Freund ◽  
Zhao Liu ◽  
Thilo Glatzel ◽  
...  
Keyword(s):  
Organic Molecules ◽  
Thermal Evaporation ◽  
Molecular Level ◽  
High Vacuum ◽  
Good Alternative ◽  
Scanning Probe ◽  
Deposition Method ◽  
Electrospray Deposition ◽  
Molecular Assemblies ◽  
Oxide Substrates

Maintaining clean conditions for samples during all steps of preparation and investigation is important for scanning probe studies at the atomic or molecular level. For large or fragile organic molecules, where sublimation cannot be used, high-vacuum electrospray deposition is a good alternative. However, because this method requires the introduction into vacuum of the molecules from solution, clean conditions are more difficult to be maintained. Additionally, because the presence of solvent on the surface cannot be fully eliminated, one has to take care of its possible influence. Here, we compare the high-vacuum electrospray deposition method to thermal evaporation for the preparation of C60 on different surfaces and compare, for sub-monolayer coverages, the influence of the deposition method on the formation of molecular assemblies. Whereas the island location is the main difference for metal surfaces, we observe for alkali halide and metal oxide substrates that the high-vacuum electrospray method can yield single isolated molecules accompanied by surface modifications.

Investigation of Ni-Al Intermetallic Thin Films

2020 ◽  
Vol 854 ◽  
pp. 140-147
Author(s):  
Vladimir N. Malikov ◽  
Alexey V. Ishkov ◽  
Alexey A. Grigorev ◽  
Denis A. Fadeev ◽  
Mihail A. Ryasnoi
Keyword(s):  
Electrical Conductivity ◽  
Ultrathin Films ◽  
Thermal Evaporation ◽  
High Vacuum ◽  
Optical Microscope ◽  
Scanning Probe ◽  
Kinetic Characteristics ◽  
Film Sample ◽  
Thermal Evaporation Method ◽  
Probe Microscope

The article describes the results of studies of Ni-Al ultrathin films obtained by the resistive thermal evaporation method and having the characteristic dimensions of islands of 700-1000 nm with a film thickness of about 500 nm. This paper presents a method of obtaining a film using a unit for creating high vacuum and the subsequent deposition of the film. The obtained film sample was studied using an optical microscope, a scanning probe microscope and a Fourier analyzer. The kinetic characteristics of the film, the film relief, and the characteristic dimensions of the islands were established; the search for regularities in the island structure of films was carried out and its electrical conductivity was determined.

Prospects for scanned-probe microscopy

1994 ◽  
Vol 52 ◽  
pp. 6-7
Author(s):  
Jean-Paul Revel
Keyword(s):  
High Vacuum ◽  
Physiological Saline ◽  
Scanning Probe ◽  
Aqueous Environment ◽  
Whole Cells ◽  
Material Scientist ◽  
Biological Objects ◽  
Spatially Resolved ◽  
Atomic Force ◽  
Scanned Probe Microscopy

In the last 50+ years the electron microscope and allied instruments have led the way as means to acquire spatially resolved information about very small objects. For the material scientist and the biologist both, imaging using the information derived from the interaction of electrons with the objects of their concern, has had limitations. Material scientists have been handicapped by the fact that their samples are often too thick for penetration without using million volt instruments. Biologists have been handicapped both by the problem of contrast since most biological objects are composed of elements of low Z, and also by the requirement that sample be placed in high vacuum. Cells consist of 90% water, so elaborate precautions have to be taken to remove the water without losing the structure altogether. We are now poised to make another leap forwards because of the development of scanned probe microscopies, particularly the Atomic Force Microscope (AFM). The scanning probe instruments permit resolutions that electron microscopists still work very hard to achieve, if they have reached it yet. Probably the most interesting feature of the AFM technology, for the biologist in any case, is that it has opened the dream of high resolution in an aqueous environment. There are few restrictions on where the instrument can be used. AFMs can be made to work in high vacuum, allowing the material scientist to avoid contamination. The biologist can be made happy as well. The tips used for detection are made of silicon nitride,(Si3N4), and are essentially unaffected by exposure to physiological saline (about which more below). So here is an instrument which can look at living whole cells and at atoms as well.

Magnetic τ-MnAlC thin film fabrication by high-vacuum thermal evaporation

2021 ◽  
pp. 129657
Author(s):  
J.D. Gamez ◽  
H. Martínez-Sánchez ◽  
J.L. Valenzuela ◽  
L. Marín ◽  
L.A. Rodríguez ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Evaporation ◽  
High Vacuum ◽  
Thin Film Fabrication ◽  
Vacuum Thermal Evaporation ◽  
Film Fabrication

scholarly journals Preparation of InSe Thin Films by Thermal Evaporation Method and Their Characterization: Structural, Optical, and Thermoelectrical Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Sarita Boolchandani ◽  
Subodh Srivastava ◽  
Y. K. Vijay
Keyword(s):  
Thin Films ◽  
Seebeck Coefficient ◽  
Thermoelectric Power ◽  
Temperature Variation ◽  
Thermal Evaporation ◽  
Low Cost ◽  
High Vacuum ◽  
Power Measurement ◽  
Thermal Evaporation Method ◽  
Evaporation Method

The indium selenium (InSe) bilayer thin films of various thickness ratios, InxSe(1-x) (x = 0.25, 0.50, 0.75), were deposited on a glass substrate keeping overall the same thickness of 2500 Ǻ using thermal evaporation method under high vacuum atmosphere. Electrical, optical, and structural properties of these bilayer thin films have been compared before and after thermal annealing at different temperatures. The structural and morphological characterization was done using XRD and SEM, respectively. The optical bandgap of these thin films has been calculated by Tauc’s relation that varies within the range of 1.99 to 2.05 eV. A simple low-cost thermoelectrical power measurement setup is designed which can measure the Seebeck coefficient “S” in the vacuum with temperature variation. The setup temperature variation is up to 70°C. This setup contains a Peltier device TEC1-12715 which is kept between two copper plates that act as a reference metal. Also, in the present work, the thermoelectric power of indium selenide (InSe) and aluminum selenide (AlSe) bilayer thin films prepared and annealed in the same way is calculated. The thermoelectric power has been measured by estimating the Seebeck coefficient for InSe and AlSe bilayer thin films. It was observed that the Seebeck coefficient is negative for InSe and AlSe thin films.

Thermal evaporation synthesis of SiC/SiOx nanochain heterojunctions and their photoluminescence properties

2014 ◽  
Vol 2 (37) ◽  
pp. 7761-7767 ◽  
Author(s):  
Haitao Liu ◽  
Zhaohui Huang ◽  
Juntong Huang ◽  
Minghao Fang ◽  
Yan-gai Liu ◽  
...  
Keyword(s):  
Silicon Wafer ◽  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Thermal Evaporation ◽  
Chemical Vapour ◽  
Deposition Method ◽  
Photoluminescence Properties ◽  
Catalyst Free ◽  
Chemical Vapour Deposition Method

Chainlike SiC/SiOx heterojunctions were prepared on a silicon wafer by a simplified catalyst-free thermal chemical vapour deposition method.

Miniature active damping stage for scanning probe applications in ultra high vacuum

2012 ◽  
Vol 83 (3) ◽  
pp. 033701 ◽  
Author(s):  
Maximilian Assig ◽  
Andreas Koch ◽  
Wolfgang Stiepany ◽  
Carola Straßer ◽  
Alexandra Ast ◽  
...  
Keyword(s):  
High Vacuum ◽  
Active Damping ◽  
Ultra High Vacuum ◽  
Scanning Probe

Photon and thermal processing of CH3NH2-bearing ices. Synthesis of prebiotic species at low temperature (such as formamide, ethylamine, and methylcyanide), and N-heterocycles during warm up.

2021 ◽  
Author(s):  
Héctor Carrascosa ◽  
Cristóbal González Díaz ◽  
Guillermo M. Muñoz Caro ◽  
Pedro C. Gómez ◽  
María Luz Sanz
Keyword(s):  
Vacuum Chamber ◽  
Organic Molecules ◽  
Solid Phase ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Quadrupole Mass ◽  
Warm Up ◽  
Methyl Cyanide ◽  
Interstellar Ice ◽  
Complex Organic

<p>Hexamethylentetramine has drawn a lot of attention due to its potential to produce prebiotic species. This work aims to gain a better understanding in the chemical processes concerning methylamine under astrophysically relevant conditions. In particular, this work deeps into the formation of N-heterocycles in interstellar ice analogs exposed to UV radiation, which may lead to the formation of prebiotic species.</p> <p>Experimental simulations of interstellar ice analogs were carried out in ISAC. ISAC is an ultra-high vacuum chamber equipped with a cryostat, where gas and vapour species are frozen forming ice samples. Infrared and ultraviolet spectroscopy were used to monitor the solid phase, and quadrupole mass spectrometry served to measure the composition of the gas phase. The variety of species detected after UV irradiation of ices containing  methylamine revealed the presence of 12 species which have been already detected in the ISM, being 4 of them typically classified as complex organic molecules: formamide (HCONH<sub>2</sub>), methyl cyanide (CH<sub>3</sub>CN), CH<sub>3</sub>NH and CH<sub>3</sub>CHNH. Warming up of the irradiated CH<sub>3</sub>NH<sub>2</sub>-bearing ice samples lead to the formation of trimethylentriamine (TMT), a N-heterocycle precursor of HMT, and the subsequent synthesis of HMT at temperatures above 230 K.</p>

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