Abstract
We investigate and report on the kinematics of photoisomerization processes of polymer composite thin films based on azo dye methyl red (MR) hosted in polymethylmethacrylate (PMMA) incorporated with Benzyl dimethyl ketal (BDK) as a photo-initiator. Understanding photoisomerization mechanisms is crucial for several optical applications such as Read/Write/Erase (WRE) optical data storage media, UV light Read/Write heads, and UV light sensors. The as-prepared polymer composite thin films are characterized using UV–Vis spectroscopy. Furthermore, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) are employed to investigate the optical, chemical, and morphological properties of trans- and cis-states of PMMA-BDK-MR polymer composite thin films. The presence of the azo dye MR in the composite is essential for the efficient performance of the cis ↔ trans cycles through illumination ↔ thermal relaxation for Write/Read/Erase optical data storage and UV-light sensors. Moreover, UV–Vis and FTIR results confirm the hysteresis cycle of trans- and cis-states and that PMMA-BDK-MR thin films may be regarded as potential candidates for successful Write/Read/Erase optical data storage and UV-light sensors. In addition, the morphology of the thin film surface is investigated by SEM technique. The SEM images indicate that uncured surfaces of PMMA-BDK-MR thin films are inhomogeneous compared with the corresponding surfaces after curing. The transformation from inhomogeneous surfaces to homogeneous surfaces is attributed to the polymerization of thin films by UV curing.
Highlights
The performance of the lowermost electronically excited states of conjugated chromophore azobenzene has attracted the attention of chemists performing experimental and theoretical works to explicate and interpret the mechanism of double-bond photoisomerization
A major majorpart partof of work is devoted the of study of the kinematics of photoisomerization of polymer of composite thin films based on azo dyebased methylon redazo (MR)dye hosted in polymethylmethacrylate processes polymer composite thin films methyl red (MR) hosted in (PMMA)
Our results indicate important to describe the highest occupied molecular orbital (HOMO) and the lowest unoccupied that PMMA-Benzyl dimethyl ketal (BDK)-MR molecules exhibit double bond transitions that can be labeled as high-intensity molecular orbital (LUMO)
Summary
The performance of the lowermost electronically excited states of conjugated chromophore azobenzene has attracted the attention of chemists performing experimental and theoretical works to explicate and interpret the mechanism of double-bond photoisomerization. A well-known feature all azo-benzenes is the proficient and arevocable thermally stable trans-state and a metastable cis-state upon illumination appropriate photon photoisomerization between a thermally stable trans-state and a with metastable cis-state upon energy. The mechanisms isomer is recuperated when the cis isomer is exposed to light of wavelength 400–450 nm, or to a of photoisomerization of the trans-cis isomer and thermally induced reverseof cis-trans isomer in hybrid proper thermal excitation. The mechanisms of photoisomerization the trans-cis isomer and polymers plays a major role in elucidating physical, electric, structural, and optical properties of thermally induced reverse cis-trans isomer in hybrid polymers plays a major role in elucidating azo-benzenes [22,23,24]. 9.0 Å in theintrans form cycles [20,21,25,26,27,28]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
