scholarly journals Thin Films of Nanocrystalline Fe(pz)[Pt(CN)4] Deposited by Resonant Matrix-Assisted Pulsed Laser Evaporation

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7135
Author(s):  
Dominik Maskowicz ◽  
Rafał Jendrzejewski ◽  
Wioletta Kopeć ◽  
Maria Gazda ◽  
Jakub Karczewski ◽  
...  
Keyword(s):  
Thin Films ◽  
Absorption Band ◽  
Spin Transition ◽  
Pulsed Laser ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Laser Evaporation ◽  
Band Shift ◽  
X Ray ◽  
Vis Spectroscopy

Prior studies of the thin film deposition of the metal-organic compound of Fe(pz)Pt[CN]4 (pz = pyrazine) using the matrix-assisted pulsed laser evaporation (MAPLE) method, provided evidence for laser-induced decomposition of the molecular structure resulting in a significant downshift of the spin transition temperature. In this work we report new results obtained with a tunable pulsed laser, adjusted to water resonance absorption band with a maximum at 3080 nm, instead of 1064 nm laser, to overcome limitations related to laser–target interactions. Using this approach, we obtain uniform and functional thin films of Fe(pz)Pt[CN]4 nanoparticles with an average thickness of 135 nm on Si and/or glass substrates. X-ray diffraction measurements show the crystalline structure of the film identical to that of the reference material. The temperature-dependent Raman spectroscopy indicates the spin transition in the temperature range of 275 to 290 K with 15 ± 3 K hysteresis. This result is confirmed by UV-Vis spectroscopy revealing an absorption band shift from 492 to 550 nm related to metal-to-ligand-charge-transfer (MLCT) for high and low spin states, respectively. Spin crossover is also observed with X-ray absorption spectroscopy, but due to soft X-ray-induced excited spin state trapping (SOXIESST) the transition is not complete and shifted towards lower temperatures.

Observations on the growth of YBa2Cu3O7-δ thin films on MgO by pulsed-laser ablation

1991 ◽  
Vol 49 ◽  
pp. 1068-1069
Author(s):  
M. Grant Norton ◽  
C. Barry Carter
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Laser Ablation ◽  
Substrate Surface ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Laser Ablation Process ◽  
Deposition Parameters

Pulsed-laser ablation has been widely used to produce high-quality thin films of YBa2Cu3O7-δ on a range of substrate materials. The nonequilibrium nature of the process allows congruent deposition of oxides with complex stoichiometrics. In the high power density regime produced by the UV excimer lasers the ablated species includes a mixture of neutral atoms, molecules and ions. All these species play an important role in thin-film deposition. However, changes in the deposition parameters have been shown to affect the microstructure of thin YBa2Cu3O7-δ films. The formation of metastable configurations is possible because at the low substrate temperatures used, only shortrange rearrangement on the substrate surface can occur. The parameters associated directly with the laser ablation process, those determining the nature of the process, e g. thermal or nonthermal volatilization, have been classified as ‘primary parameters'. Other parameters may also affect the microstructure of the thin film. In this paper, the effects of these ‘secondary parameters' on the microstructure of YBa2Cu3O7-δ films will be discussed. Examples of 'secondary parameters' include the substrate temperature and the oxygen partial pressure during deposition.

Chemical Bath Deposition of Lead Sulphide (PbS) Thin Film and their Characterization

2013 ◽  
Vol 209 ◽  
pp. 111-115 ◽  
Author(s):  
Sandip V. Bhatt ◽  
M.P. Deshpande ◽  
Bindiya H. Soni ◽  
Nitya Garg ◽  
Sunil H. Chaki
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Raman Spectroscopy ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Excitation Wavelength ◽  
Face Centered Cubic ◽  
Phonon Modes ◽  
Lead Sulphide ◽  
X Ray

Thin film deposition of PbS is conveniently carried out by chemical reactions of lead acetate with thiourea at room temperature. Energy dispersive analysis of X-ray (EDAX), X-ray diffraction (XRD), selected area electron diffraction patterns (SAED), UV-Vis-NIR spectrophotometer, Scanning Electron Microscopy (SEM), Atomic force microscopy (AFM), Photoluminescence (PL) and Raman spectroscopy techniques are used for characterizing thin films. EDAX spectra shows that no impurity is present and XRD pattern indicates face centered cubic structure of PbS thin films. The average crystallite size obtained using XRD is about 15nm calculated using Scherrer’s formula and that determined from Hall-Williamson plot was found to be 18nm. SAED patterns indicate that the deposited PbS thin films are polycrystalline in nature. Blue shift due to quantum confinement was seen from the UV-Vis-NIR absorption spectra of thin film in comparison with bulk PbS. The Photoluminescence spectra obtained for thin film with different excitation sources shows sharp emission peaks at 395nm and its intensity of photoluminescence increases with increasing the excitation wavelength. Raman spectroscopy of deposited thin film was used to study the optical phonon modes at an excitation wavelength of 488nm using (Ar+) laser beam.

scholarly journals Tunable internal quantum well alignment in rationally designed oligomer-based perovskite films deposited by resonant infrared matrix-assisted pulsed laser evaporation

2019 ◽  
Vol 6 (8) ◽  
pp. 1707-1716 ◽  
Author(s):  
Wiley A. Dunlap-Shohl ◽  
E. Tomas Barraza ◽  
Andrew Barrette ◽  
Seyitliyev Dovletgeldi ◽  
Gamze Findik ◽  
...  
Keyword(s):  
Thin Film ◽  
Quantum Well ◽  
Pulsed Laser ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Inorganic Materials ◽  
Laser Evaporation

RIR-MAPLE enables thin-film deposition of organic–inorganic materials with tunable synergistic photophysics.

Synthesis and Characterization of MoS2 Thin Films Grown by Pulsed Laser Evaporation

1988 ◽  
Vol 140 ◽  
Author(s):  
M. S. Donley ◽  
P. T. Murray ◽  
N. T. McDevitt
Keyword(s):  
Thin Films ◽  
Pulsed Laser ◽  
Plasma Temperature ◽  
Laser Evaporation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Plot Analysis ◽  
Glancing Angle ◽  
Substrate Temperatures

AbstractThe growth and characterization of MoS thin films grown by pulsed laser evaporation is investigated. TOF anafysis of the ions evaporated from an MoS2 target indicates that PLE results primarily in the evaporation of atomic Mo and S species; MoxSy clusters were also detected, but were present at a significantly Iower intensity. TOF velocity analysis indicates an effective plasma temperature of 1500K. Stoichiometric MoS2 films were grown at substrate temperatures between room temperature and 500ºC under the above laser conditions. XPS data is used to develop a Wagner chemical state plot. Analysis of the films by Raman spectroscopy and glancing angle x-ray diffraction indicates the films to be crystalline, hexagonal MoS2, with a tendency for basal plane orientation parallel to the substrate.

SUPERCONDUCTING Bi-Sr-Ca-Cu-O THIN FILMS PREPARED BY THE PULSED-LASER EVAPORATION

1988 ◽  
Vol 02 (08) ◽  
pp. 999-1003
Author(s):  
F.M. ZHANG ◽  
Y.C. ZHANG ◽  
S.J. GU ◽  
Y.L. ZHOU ◽  
Z.H. CHEN ◽  
...  
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
Nd:Yag Laser ◽  
Pulse Width ◽  
Pulsed Laser ◽  
Laser Pulses ◽  
Laser Evaporation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zero Resistance

We report here the preparation of the superconducting Bi-Sr-Ca-Cu-O thin films on SrTiO 3(100) substrates by a Nd:YAG laser, which provides laser pulses with wavelength of 1.06µm and pulse width of 200ns. After the heat treatment at 850°C for half an hour in oxygen flow, the samples exhibit superconductivity with the zero resistance at 66.8K and the onset temperature around 84K. X-ray diffraction analyses show that the samples have the preferred orientation with the c-axis perpendicular to the substrate.

scholarly journals Matrix-Assisted Pulsed Laser Thin Film Deposition by Using Nd:YAG Laser

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Francesco Bloisi ◽  
Mario Barra ◽  
Antonio Cassinese ◽  
Luciano Rosario Maria Vicari
Keyword(s):  
Nd:Yag Laser ◽  
Laser Energy ◽  
Pulsed Laser ◽  
Thin Film Deposition ◽  
Laser Wavelength ◽  
Film Deposition ◽  
Laser Evaporation ◽  
Polymeric Thin Films ◽  
Transparent Liquid ◽  
Desorption Mechanism

Matrix-Assisted Pulsed Laser Evaporation (MAPLE) is a deposition technique, developed from Pulsed Laser Deposition (PLD) especially well suited for producing organic/polymeric thin films, which can take advantage from using Nd:YAG laser. Depending on the relative values of light absorption coefficients of the solvent and of the molecules to be deposited, laser energy is directly absorbed by the solvent or is transferred to it, providing a softer desorption mechanism with respect to PLD. In PLD ultraviolet laser radiation is commonly used, but in MAPLE, since easily damaged molecules are usually involved, the use of Nd:YAG laser offers the advantage to allow selecting laser wavelength from ultraviolet (266 nm or 355 nm, corresponding to 4.66 eV or 3.49 eV photon energies, resp.) to visible (532 nm, 2.33 eV) to infrared (1064 nm, 1.17 eV). In this paper, the MAPLE technique is described in details, together with a survey of current and possible future applications for both organic and biomaterial deposition taking into account the advantages of using an Nd:YAG laser. Beside other results, we have experimental confirmation that MAPLE applications are not limited to transparent molecules highly soluble in light absorbing solvent, thus allowing deposition of poorly soluble light absorbing molecules suspended in a light transparent liquid.

Pulsed Laser Deposition of Laterally Graded X-Ray Optical Multilayers on Substrates of Technical Relevance

1995 ◽  
Vol 382 ◽  
Author(s):  
R. Dietsch ◽  
TH. Holz ◽  
R. Krawietz ◽  
H. Mai ◽  
B. SchÖneich ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Thickness Distribution ◽  
Pulsed Laser ◽  
Single Layer ◽  
Thin Film Deposition ◽  
Optical Quality ◽  
Film Deposition ◽  
Laser Deposition ◽  
Emission Characteristic ◽  
X Ray

ABSTRACTPulsed Laser Deposition (PLD) is used for the preparation of Ni/C, W/C, and Mo/Si multilayers having X-ray optical quality. For the synthesis of layer stacks involving a uniform or a graded thickness distribution across 4"-wafers the conventional thin film deposition equipment of PLD has been modified. This modification provides a precise spatial control of the plasma plume orientation in the deposition chamber. With this arrangement the emission characteristic of the plasma source can be computer controlled and the desired coating profile can be tailored across an extended substrate via a stepper-motor-driven target manipulator.Thus film thickness uniformity (δts < 2%) is obtained on substrates up to 4" diameter even for smaller target-substrate distances. For laterally graded Ni and C individual layers linear thickness gradients of dts/dx = 3.2 × 10−8 were confirmed over the total substrate length by spectroscopic ellipsometry. The parameters deduced from single layer deposition were applied for the synthesis of laterally graded Ni/C multilayers. A mean value of the gradient of the stack period thickness dt/dx = 6.2 × 10−8 confirmed by X-ray reflectometry (nominal value: dt0 /dx = 6.4×10−8 ) characterizes precision and reproducibility of the coating process.

Electron microscopy of pulsed-laser-deposited thin films for tribological applications

1993 ◽  
Vol 51 ◽  
pp. 852-853
Author(s):  
Scott D. Walck ◽  
Jeffrey S. Zabinski ◽  
Michael S. Donley
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Thin Film Deposition ◽  
Film Deposition ◽  
Spherical Particles ◽  
Significant Feature ◽  
Great Success ◽  
Deposition Technique ◽  
Coating Materials

Pulsed laser deposition (PLD) is a novel thin film deposition technique which has recently been applied to tribological materials with great success. PLD has several inherent advantages over conventional deposition techniques, including excellent film adhesion, replication of target chemistry, and low film deposition temperature. Because load-bearing materials are typically hardened, heat treated alloys, these properties of PLD are ideally suited for tribological applications. In addition to being a relatively simple deposition technique, considerable processing flexibility is inherent with PLD. Dense, nonporous, stoichiometric films of solid lubricants, such as MoS2, have been grown having long wear lives with low coefficients of friction. Hard coating materials, such as TiC, have been grown at room temperature that were polycrystalline and had excellent wear properties.A significant feature of pulsed laser deposited (PLD) thin films is the incorporation of spherical particles within the films. Figure 1 shows these particles embedded in a film of PLD MoS2 deposited at room temperature.

scholarly journals A Novel Approach for Fabricating LaMnO3 Thin Films Using Combined Microwave Combustion and Pulsed Electron Deposition Techniques

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Thi Ha Tran ◽  
Thi Trung Anh Tang ◽  
Nguyen Hai Pham ◽  
Thanh Cong Bach ◽  
Cong Doanh Sai ◽  
...  
Keyword(s):  
Thin Films ◽  
Flux Ratio ◽  
Combustion Method ◽  
Thin Film Deposition ◽  
Discharge Voltage ◽  
Film Deposition ◽  
X Ray ◽  
Microwave Combustion ◽  
Novel Approach ◽  
Pulsed Electron Deposition

LaMnO3 (LMO) nanopowder was synthesized by the microwave combustion method using glycine and nitrate salts of La and Mn as precursors. The as-prepared LMO powder was pressed at high pressure and annealed at 1000°C for 8 hours to make a target for thin film deposition. The structural and elemental analysis was obtained by X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). Thin films of LMO were fabricated using pulsed electron deposition (PED) at room temperature. The effects of discharge voltage and oxygen/argon flux ratio on the produced thin films were studied. The study shows that stoichiometry and structure of the target was preserved well in the thin films prepared with a discharge voltage from 14 to 15 kV, while the oxygen/nitrogen flux ratio did not show a clear effect on the quality of thin films.

Matrix Assisted Pulsed Laser Evaporation of Poly (D, L) Lactic Acid Films

2004 ◽  
Vol 845 ◽  
Author(s):  
Timothy M. Patz ◽  
Anand Doraiswamy ◽  
Roger Narayan ◽  
Nicola Menegazzo ◽  
Christine Kranz ◽  
...  
Keyword(s):  
Thin Films ◽  
Lactic Acid ◽  
Photoelectron Spectroscopy ◽  
Pulsed Laser ◽  
Laser Evaporation ◽  
Absorption Bands ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Tissue Interface

ABSTRACTWe have deposited poly (D, L lactic acid) (PDLLA) thin films using matrix assisted pulsed laser evaporation (MAPLE). FTIR spectroscopy revealed that the PDLLA had similar absorption bands to the dropcast material. X-ray photoelectron spectroscopy has shown that peaks corresponding to C-H, C-O and C=O represented 38.4, 30.1 and 31.4% of the C1s spectrum, respectively. XPS O1s analysis revealed that the O=C and O-C components make up 52 and 48 % of the O1s content. Atomic force microscopy revealed that MAPLE deposition provides smooth, continuous thin biomaterial films. These matrix assisted pulsed laser evaporation-deposited biomaterial thin films may serve to improve the implant/tissue interface.

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