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Polymer -modified graphene nonlinear optical functional materials design and preparation

Author: LiPeiPei
Tutor: Chen
School: East China University of Science and Technology
Course: Advanced Materials and Manufacturing Technology
Keywords: Graphene Optical limiting Polymer Covalent modification
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 444
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Abstract


Graphene with its unique two-dimensional structure and excellent electrical, optical, thermal and mechanical properties, much vigorous interest in scientific research institutions, and quickly became materials, chemistry, physics and engineering research focus, but due to poor solubility, its application subject to certain restrictions. Therefore, the design, preparation of graphene-based soluble organic / polymeric materials has become the development of graphene-based molecular optoelectronic materials and optics of the key. Adjustable polymer structure, easy processing, by a certain method to graft the graphene, to improve the solubility and enhance its graphene optical limiting performance performance purposes. This article was prepared several new polymers covalently modified graphene hybrid materials, the structure is characterized, and a preliminary study of their nonlinear optical (Hanguangmen limiter) performance. The first chapter briefly describes the preparation of graphene and its derivatives and research progress. Chapter II of poly (N-vinylcarbazole) (PVK) covalently grafted to restore graphene (RGO), we obtain hybrid materials RGO-PVK. In the hybrid material as PVK play the role of surfactants, RGO solubility has been significantly improved. PVK covalently grafted to the surface resulting RGO RGO Raman spectrum D, G with redshift, and RGO-PVK Raman spectra of ID / IG ratio increased compared to the RGO. Compared with the PVK, the resulting hybrid materials RGO-PVK due to different mechanisms of nonlinear optical effective combination in 532 nm and 1064 nm showed excellent broadband optical limiting response. Chapter amidation reaction using graphene oxide (GO) and polyaniline (PANI) covalently bonded to the modified polyaniline obtained GO GO-PANI. From the GO-PANI infrared spectra can clearly see on the GO carboxyl C = O stretching vibration peak disappeared, while the amide groups in the C = O and CN bond stretching vibration peaks. The silver nanoparticles doped polyaniline, and the resulting silver nanoparticles modified polyaniline Ag / PANI.TEM image can be clearly seen than Ag nanoparticles uniformly dispersed in the PANI. Test results show that the nonlinear optical properties of GO-PANI and Ag / PANI at 532 nm are shown under the enhanced optical limiting performance. In addition, by comparing the GO-PANI and Ag / PANI optical limiting performance shows that under the 532 nm optical limiting GO right PANI performance enhancement than Ag on PANI enhancement. Chapter 4, were prepared and polyethylenedioxythiophene thiophene thiophene (PEDOT) covalently modified graphene composites rGO-PEDOT, and study the performance of optical limiting materials. IR spectra can prove that α, β-α ', β'-unsaturated ketone carbonyl and 3,4 - ethylenedioxythiophene COC bond in the presence of phenol. Thiophene and PEDOT grafted after, GO Raman spectra D, G band Positional thiophene, PEDOT and the interaction between rGO. And rGO-PEDOT at 532 nm also showed lower optical limiting response. Chapter V, the use of amidation reaction using poly [(1,4 - phenylenediamine) - (3,6-N-octyl carbazole)] (PACz) covalent modification of graphene oxide (GO), synthesized hybrid materials GO-PACz, has significantly improved solubility compared to GO. IR spectra of GO-PACz presence amide group C = O bond of characteristic peaks from the XPS Nls same spectra can be observed amide bond (NH-C = O) of the characteristic peaks of N. GO-PACz optical limiting performance is still being tested.

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