Exploring Novel Spintronic Responses from Advanced Functional Organic Materials
Abstract
In this project, we investigated magnetic property of pi-conjugated molecules and application of spin-radical containing molecule. This report has three parts. First, we will report the results of organic magnetoresistance (OMAR) in field effect transistors. We observed OMAR in ambipolar field effect transistors based on Hex-4-TFPTA. Underlying mechanism of OMAR was tuned by changing source-drain voltage from positive (+100 V) to negative (- 100 V) at fixed gate voltage (+100V). The maximum MR values were +3% and +0.4% at 100 mT, respectively. We conclude that dominant OMAR mechanism can be changed by injecting minority charge carriers. Second, we will report on the spin-radical containing fluorescent organic molecule for ascorbic acid (AA) sensor. A novel nitronylnitroxide derivative (NN-CN-TFFP) for highly sensitive and selective detection of AA operating over broad concentration range from 1 micron to 2 mM is reported. The probe showed 260-fold fluorescence turn-on and diminished electron spin resonance (ESR) signal upon AA addition. Finally, we will briefly report the result of collaboration work with Prof. Bin Hu group has characterized optically tunable Seebeck effect from the intramolecular proton-transfer materials originally synthesized in our group.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 10, 2015
- Accession Number
- ADA626929
Entities
People
- Jin H. Kim
- Soo Y. Park
Organizations
- Seoul National University