scholarly journals Cover Feature: Steady‐State and Time‐Resolved Optical Properties of Multilayer Film of Titanium Dioxide Sandwiched by Gold Nanoparticles and Gold Thin Film (ChemNanoMat 8/2019)

ChemNanoMat ◽  
2019 ◽  
Vol 5 (8) ◽  
pp. 975-975
Author(s):  
Shin‐ichiro Yanagiya ◽  
Toshihiko Takahata ◽  
Yuki Yoshitani ◽  
Retsuo Kawakami ◽  
Akihiro Furube
Keyword(s):  
Thin Film ◽  
Gold Nanoparticles ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Steady State ◽  
Multilayer Film ◽  
Time Resolved ◽  
Gold Thin Film

Steady‐State and Time‐Resolved Optical Properties of Multilayer Film of Titanium Dioxide Sandwiched by Gold Nanoparticles and Gold Thin Film

ChemNanoMat ◽  
2019 ◽  
Vol 5 (8) ◽  
pp. 1015-1020
Author(s):  
Shin‐ichiro Yanagiya ◽  
Toshihiko Takahata ◽  
Yuki Yoshitani ◽  
Retsuo Kawakami ◽  
Akihiro Furube
Keyword(s):  
Thin Film ◽  
Gold Nanoparticles ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Steady State ◽  
Multilayer Film ◽  
Time Resolved ◽  
Gold Thin Film

Sol–gel synthesis and optical properties of titanium dioxide thin film

2018 ◽  
Vol 32 (09) ◽  
pp. 1850076 ◽  
Author(s):  
Irfan Ullah ◽  
Shaukat Ali Khattak ◽  
Tanveer Ahmad ◽  
Saman ◽  
Nayab Ali Ludhi
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Band Gap ◽  
Surface Defects ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Localized States ◽  
Indirect Transition ◽  
Transmission And Absorption

The titanium dioxide (TiO2) is synthesized by sol–gel method using titanium-tetra-iso-propoxide (TTIP) as a starting material, and deposited on the pre-cleaned glass substrate using spin coating technique at optimized parameters. Energy dispersive X-ray (EDX) spectroscopy confirms successful TiO2 growth. The optical properties concerning the transmission and absorption spectra show 85% transparency and 3.28 eV wide optical band gap for indirect transition, calculated from absorbance. The exponential behavior of absorption edge is observed and attributed to the localized states electronic transitions, curtailed in the indirect band gap of the thin film. The film reveals decreasing refractive index with increasing wavelength. The photoluminescence (PL) study ascertains that luminescent properties are due to the surface defects.

scholarly journals Narrowband Spontaneous Emission Amplification from a Conjugated Oligomer Thin Film

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 232
Author(s):  
Mohamad S. AlSalhi ◽  
Mamduh J. Aljaafreh ◽  
Saradh Prasad
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Absorption Spectrum ◽  
Spontaneous Emission ◽  
Spin Coating ◽  
Quartz Substrate ◽  
Pump Energy ◽  
Laser Induced Fluorescence ◽  
Time Resolved

In this paper, we studied the laser and optical properties of conjugated oligomer (CO) 1,4-bis(9-ethyl-3-carbazo-vinylene)-9,9-dihexyl-fluorene (BECV-DHF) thin films, which were cast onto a quartz substrate using a spin coating technique. BECV-DHF was dissolved in chloroform at different concentrations to produce thin films with various thicknesses. The obtained results from the absorption spectrum revealed one sharp peak at 403 nm and two broads at 375 and 428 nm. The photoluminescence (PL) spectra were recorded for different thin films made from different concentrations of the oligomer solution. The threshold, laser-induced fluorescence (LIF), and amplified spontaneous emission (ASE) properties of the CO BECV-DHF thin films were studied in detail. The ASE spectrum was achieved at approximately 482.5 nm at a suitable concentration and sufficient pump energy. The time-resolved spectroscopy of the BECV-DHF films was demonstrated at different pump energies.

scholarly journals Study of Effect of the Chrome Additive on the Structural, Morphology and Optical Properties of Nanostructured Titanium dioxide Thin Film

2021 ◽  
Vol 1999 (1) ◽  
pp. 012061
Author(s):  
Adnan M Saleh ◽  
Fatima Waly Ridha ◽  
Abdulhussain A Khadayeir ◽  
Mohammed O Dawood ◽  
Nadir F Habubi ◽  
...  
Keyword(s):  
Thin Film ◽  
Titanium Dioxide ◽  
Optical Properties ◽  
Structural Morphology ◽  
Nanostructured Titanium

scholarly journals Improved Sensitivity of Surface-Enhanced Raman Scattering with Gold Nanoparticles-Insulator-Metal Sandwich Layers on Flat Sapphire Substrate

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2416
Author(s):  
Wenbing Li ◽  
Xin Tong ◽  
Zhuo Yang ◽  
Jiali Zhang ◽  
Bo Liu ◽  
...  
Keyword(s):  
Thin Film ◽  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Sapphire Substrate ◽  
Silicon Substrate ◽  
Raman Microscopy ◽  
Gold Thin Film ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering (SERS) as a high sensitivity analytical method for molecule detection has attracted much attention in recent research. In this work, we demonstrated an improved SERS substrate, which has the gold nanoparticles randomly distributed on a SiO2 interception layer over a gold thin film layer on the flat sapphire substrate (AuNP/SiO2/Au/Sapphire), over the dispersed gold nanoparticles on a silicon substrate (AuNP/Si), for detection of R6G (1 × 10−6 M) in a Raman microscope. The fabrication of sandwich layers on top of the sapphire substrate involves evaporation of a gold mirror as thick as 100 nm, plasma enhanced chemical vapor deposition of the silica insulator layer 10 nm thick, and evaporation of a thin gold layer 10 nm thick for forming gold nanoparticles. For comparison, a gold thin film with a thickness of 5 nm and 10 nm was evaporated on a silicon substrate, respectively (AuNP/Si), as the reference SERS substrates in the experiment. The AuNP/SiO2/Au/Sapphire substrate demonstrated improved sensitivity in detection of molecules in Raman microscopy, which can enable the molecules to be recognizable at a low laser power as 8.5 × 10−3 mW, 0.017 mW, 0.085 mW, and 0.17 mW for ultrashort exposure time. The simulation of AuNP/SiO2/Au/Sapphire substrate and AuNP/Si substrate, based on the finite-difference time-domain (FDTD) method, explained the improved sensitivity for detection of R6G molecules from the view of classical electromagnetics, and it suggested the optimized size for the gold nanoparticles and the optimized laser wavelength for Raman microscopy for further research.

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