scholarly journals An Evaluation of Optical Absorbance Kinetics for the Detection of Micro-Porosity in Molecularly Doped Polymer Thin-Films

Solids ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 155-164
Author(s):  
David Mitchell Goldie ◽  
Orlaith Skelton ◽  
Thomas James Bailey
Keyword(s):  
Thin Films ◽  
Polymer Films ◽  
Ultra Violet ◽  
Uv Absorbance ◽  
Cellular Automata Model ◽  
Optical Absorbance ◽  
Photo Oxidation ◽  
Highly Sensitive ◽  
Cyclic Reaction ◽  
Doped Polymer

The use of optical absorbance kinetics to identify micro-porous regions in doped polymer films is evaluated. Data are presented for a series of hydrazone doped polymer films which are found to optically bleach upon exposure to an ultra violet (UV) radiation source. The UV absorbance kinetics are found to exhibit distinctive characteristics for the various polymers studied, with changes in film absorbance occurring either in a fast (<103 s) or slow (>104 s) timescale. An interpretation of these distinctive timescales based upon a cellular-automata model of the absorbance kinetics suggests that the underlying photo-oxidation of the hydrazone is highly sensitive to underlying micro-porosity in the films which controls the necessary supply of absorbed oxygen for photo-cyclic reaction.

scholarly journals Development of highly sensitive fluorescent sensor and fluorescent sensor-doped polymer films for trace amounts of water based on photo-induced electron transfer

2021 ◽  
Author(s):  
Saori Miho ◽  
Takuma Fumoto ◽  
Yuta Mise ◽  
Keiichi Imato ◽  
Seiji Akiyama ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Polymer Films ◽  
Fluorescent Sensor ◽  
Cyano Group ◽  
Phenylboronic Acid ◽  
Hydroxymethyl Group ◽  
Highly Sensitive ◽  
Water Based ◽  
Photo Induced Electron Transfer ◽  
Doped Polymer

Anthracene-(aminomethyl)phenylboronic acid pinacol ester (AminoMePhenylBPin) SM-1 having a cyano group as an electron-withdrawing substituent and a hydroxymethyl group has been developed as a highly sensitive PET (photo-induced electron transfer)-type fluorescent...

Optical investigations on sputtered CuCl thin films

2005 ◽  
Vol 891 ◽  
Author(s):  
Gomathi Natarajan ◽  
Anirban Mitra ◽  
Lisa O'Reilly ◽  
Stephen Daniels ◽  
David C. Cameron ◽  
...  
Keyword(s):  
Thin Films ◽  
Room Temperature ◽  
Free Exciton ◽  
Ultra Violet ◽  
Rf Magnetron Sputtering ◽  
Potential Candidate ◽  
X Ray Diffraction ◽  
Optical Absorbance ◽  
Uv Emission ◽  
Silicon Device

ABSTRACTCopper (I) chloride (CuCl) is a potential candidate for ultra violet optoelectronics due to the fact that it is closely lattice matched with silicon, which makes it readily integrable with silicon device technology. The structural and optoelectronic properties of CuCl thin films deposited by RF magnetron sputtering are investigated. The crystallinity is studied using X-ray diffraction which confirms the growth of CuCl thin films with cubic zinc blende structure predominantly orientated in <111> direction. Excitonic transitions in the thin films were thoroughly investigated using optical absorbance and luminescence spectroscopies. Room temperature absorption spectroscopic analysis confirms the existence of two exciton peaks namely Z12 and Z3 at 372 and 380 nm respectively. A strong UV emission is observed at room temperature in cathodoluminescence and photoluminescence spectra due to the recombination of Z3 exciton at approximately 384 nm. In the low temperature photoluminescence spectrum, a free exciton (Z3) and a bound exciton (I1) are observed. A variation of 1.3 nm to 10 nm was observed in the Z3 exciton line width from 10 K to 300 K.

Stability Investigation in the Optical Properties of Thermally Evaporated Ge5Se95-x Znx Thin Films

2015 ◽  
Vol 7 (3) ◽  
pp. 1923-1930
Author(s):  
Austine Amukayia Mulama ◽  
Julius Mwakondo Mwabora ◽  
Andrew Odhiambo Oduor ◽  
Cosmas Mulwa Muiva ◽  
Boniface Muthoka ◽  
...  
Keyword(s):  
Thin Films ◽  
Band Gap ◽  
Optical Band Gap ◽  
Thermal Evaporation ◽  
Optical Transition ◽  
Bulk Material ◽  
Band Gap Energy ◽  
Optical Absorbance ◽  
Gap Energy ◽  
Constituent Elements

 Selenium-based chalcogenides are useful in telecommunication devices like infrared optics and threshold switching devices. The investigated system of Ge5Se95-xZnx (0.0 ≤ x ≤ 4 at.%) has been prepared from high purity constituent elements. Thin films from the bulk material were deposited by vacuum thermal evaporation. Optical absorbance measurements have been performed on the as-deposited thin films using transmission spectra. The allowed optical transition was found to be indirect and the corresponding band gap energy determined. The variation of optical band gap energy with the average coordination number has also been investigated based on the chemical bonding between the constituents and the rigidity behaviour of the system’s network.

Endgroup and Sidechain Functionalization of Surface-Initiated ROMP Thin Films: Progress Towards ROMP-Based Molecular Wires

2018 ◽  
Author(s):  
Nicholas Marshall
Keyword(s):  
Thin Films ◽  
Contact Angle ◽  
Cyclic Voltammetry ◽  
Polymer Films ◽  
Conjugated Polymer ◽  
Ring Opening ◽  
Molecular Wires ◽  
Metathesis Polymerization ◽  
Cross Metathesis ◽  
Active Ester

A set of experiments in surface-initiated ring-opening metathesis polymerization, including end-functionalization of growing brushes and contact angle/cyclic voltammetry measurements. We report preparation and CV of two different conjugated polymer films, and several endgroup and sidechain functionalization experiments using cross-metathesis and active ester substitution.<br>

Sensitive Mechanocontrolled Luminescence in Cross-Linked Polymer Films

2019 ◽  
Author(s):  
Ayumu Karimata ◽  
Pradnya Patil ◽  
Eugene Khaskin ◽  
Sébastien Lapointe ◽  
robert fayzullin ◽  
...  
Keyword(s):  
Mechanical Stress ◽  
Polymer Films ◽  
Soft Matter ◽  
Small Strain ◽  
Visual Methods ◽  
Photoluminescence Intensity ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Highly Sensitive ◽  
Mechanical Stretching

Direct translation of mechanical force into changes in chemical behavior on a molecular level has important implication not only for the fundamental understanding of mechanochemical processes, but also for the development of new stimuli-responsive materials. In particular, detection of mechanical stress in polymers via non-destructive methods is important in order to prevent material failure and to study the mechanical properties of soft matter. Herein, we report that highly sensitive changes in photoluminescence intensity can be observed in response to the mechanical stretching of cross-linked polymer films when using stable, (pyridinophane)Cu-based dynamic mechanophores. Upon stretching, the luminescence intensity increases in a fast and reversible manner even at small strain (< 50%) and applied stress (< 0.1 MPa) values. Such sensitivity is unprecedented when compared to previously reported systems based on organic mechanophores. The system also allows for the detection of weak mechanical stress by spectroscopic measurements or by direct visual methods.<br>

Doped polymer films with high nonlinear refractive indices

1996 ◽  
Vol 32 (2) ◽  
pp. 129 ◽  
Author(s):  
Z.X. Zhang ◽  
W. Qiu ◽  
E.Y.B. Pun ◽  
P.S. Chung ◽  
Y.Q. Shen
Keyword(s):  
Polymer Films ◽  
Refractive Indices ◽  
Doped Polymer

Vacuum ultra-violet spectroscopic ellipsometry study of sputtered BeZnO thin films

Optik ◽  
2011 ◽  
Vol 122 (22) ◽  
pp. 2050-2054 ◽  
Author(s):  
Jebreel M. Khoshman ◽  
Martin E. Kordesch
Keyword(s):  
Thin Films ◽  
Spectroscopic Ellipsometry ◽  
Ultra Violet ◽  
Vacuum Ultra Violet

Atmospheric effects on corona poling of nonlinear optical doped polymer films

1990 ◽  
Author(s):  
Shelly J. Bethke ◽  
Stephen G. Grubb ◽  
Hilary S. Lackritz ◽  
John M. Torkelson
Keyword(s):  
Polymer Films ◽  
Nonlinear Optical ◽  
Atmospheric Effects ◽  
Corona Poling ◽  
Doped Polymer
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