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Renuka, C.G.,Raikar, U.S. Korean Society of Photoscience 2005 Journal of Photosciences Vol.12 No.3
The photophysical properties of coumarin 6 laser dye have been studied in two solvents; ethanol and acetonitrile using steady-state fluorescence depolarization technique. The experimentally measured reorientation time of coumarin 6 is more or less the same in given solvents at particular temperature. It is found that coumarin 6 rotates slower in acetonitrile than in ethanol especially at higher values of viscosity over temperature. We also measure the ground and excited state dipole moments of coumarin 6 by solvent perturbation method. The results found that excited state dipole moment is greater than ground state dipole moment, which indicates that excited state is more polar than the ground state.
Time Resolved Infrared Spectroscopy of Electro-optic Switching of 5CB
Jang, Won-Gun The Korean Infomation Display Society 2004 Journal of information display Vol.5 No.1
Time resolved infrared IR absorption spectroscopy is carried out to investigate the dynamics of electric field induced reorientation of the biphenyl molecular core and alkyl tail sub-fragments of the nematic liquid crystal 5CB (4-pentyl-4-cyano-biphenyl). The planar to homeotropic transition for high pre-tilt planar aligned cells, is studied for switching times ranging from 200 ${\mu}sec$ down to 80 ${\mu}sec$, the latter a factor of 1000 times faster than any previous nematic IR study. The reorientation rates of the core and tail are found to be the same to within experimental error and scale inversely with applied field squared, as expected for the balance of field and viscous torques. Thus any molecular conformation change during switching must relax on a shorter time scale. A simple model shows that no substantial differences exist between the reorientational dynamics of the tails and cores on the time scales longer than on the order of 10 ${\mu}s$.
Ultrasensitive artificial synapse based on conjugated polyelectrolyte
Xu, Wentao,Nguyen, Thanh Luan,Kim, Young-Tae,Wolf, Christoph,Pfattner, Raphael,Lopez, Jeffrey,Chae, Byeong-Gyu,Kim, Sung-Il,Lee, Moo Yeol,Shin, Eul-Yong,Noh, Yong-Young,Oh, Joon Hak,Hwang, Hyunsang,Pa Elsevier 2018 Nano energy Vol.48 No.-
<P><B>Abstract</B></P> <P>Emulating essential synaptic working principles using a single electronic device has been an important research field in recent years. However, achieving sensitivity and energy consumption comparable to biological synapses in these electronic devices is still a difficult challenge. Here, we report the fabrication of conjugated polyelectrolyte (CPE)-based artificial synapse, which emulates important synaptic functions such as paired-pulse facilitation (PPF), spike-timing dependent plasticity (STDP) and spiking rate dependent plasticity (SRDP). The device exhibits superior sensitivity to external stimuli andlow-energy consumption. Ultrahigh sensitivity and low-energy consumption are key requirements for building up brain-inspired artificial systems and efficient electronic-biological interface. The excellent synaptic performance originated from (i) a hybrid working mechanism that ensured the realization of both short-term and long-term plasticity in the same device, and (ii) the mobile-ion rich CPE thin film that mediate migration of abundant ions analogous to a synaptic cleft. Development of this type of artificial synapse is both scientifically and technologically important for construction of ultrasensitive highly-energy efficient and soft neuromorphic electronics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Conjugated polyelectrolyte (CPE)-based artificial synapse was fabricated. </LI> <LI> Important working principles of a biological synapse are emulated. </LI> <LI> The artificial synapse potentially exhibited ultrahigh sensitivity and low energy consumption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>An artificial synapse is fabricated to emulate biological functions with high sensitivity and low-energy consumption</P> <P>[DISPLAY OMISSION]</P>