Akademik Veri Yönetim Sistemi
International Conference on Advanced Materials Science & Engineering and High Tech Devices Applications; Exhibition (ICMATSE 2024), Ankara, Türkiye, 24 - 26 Ekim 2024, ss.175-177
Advances in nanoscience and nanotechnology bring about several application possibilities. Artificially designed materials are of critical importance in these applications. On the other hand, Liquid Crystals (LC) are critically important materials enabling amazing application possibilities due to their nonlinear characters. Their self-assembled properties and spatial control possibilities provides various designs. They are utilized in a wide range of display devices, such as TVs, clocks, visors, computer monitors, laptop screens, digital screens and billboards and navigation systems. An arrangement of liquid crystals under the direction of each pixel's unique electromagnetic field makes up a display pixel.
Lead Sulfide (PbS) semiconductor quantum dots have excellent optical properties, suitable band width and near infrared emission wavelength range of 900 nm and 1600 nm. By controlling their size, they can easily extend the absorption wavelength of the primary exciton into the near infrared region. The calculated Bohr exciton radius for PbS semiconductors is approximately 20 nm, and the energy range can be tuned between 0.7 eV and 2.1 eV depending on the particle size. In this study, PbS quantum dots are doped to NLCs in various percentages (v/v). Dielectric Spectroscop y technique and I/V measurements revealed a detailed investigation of the electrical properties of the samples. It was found that doping small amounts of PbS nanoparticles improve the electrical behavior and noteworthy advances are observed in conductivity with PbS. Dependency of electrical characters to PbS give inspirations for possible exploitation of plasmonic aims with such samples and encourages further research for implementing plasmonically dominant NLC samples with suitable nanoparticles. To analyze the electrical behavior of produced samples, a LCR meter and a Source Meter were used. The capacitance-voltage (C-V) measurements were performed in the 0-5 V bias voltage range at different frequencies for pure and PbS added NLC samples.