Journal ArticleDOI
Semiconductivity of thiourea
S. R. Yoganarasimhan,R. K. Sood +1 more
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TLDR
In this paper, the conduction and thermoelectric powers of thiourea have been reported and the mobility of the charge carriers appears to be somewhat low, and Trapping of majority carriers is suggested to be responsible for the observed abnormalities.Abstract:
As part of an extensive programme on semiconduction in aliphatic molecular crystals, the conduction and thermoelectric powers of thiourea have been reported. Thiourea is found to be a p-type electronic semiconductor, has a very high value of Seebeck coefficient and has a high energy of activation for carrier generation (2.70 ev). The mobility of the charge carriers appears to be somewhat low. The results have been discussed on the basis of the model proposed by Johnson and Lark-Horowitz. Trapping of majority carriers is suggested to be responsible for the observed abnormalities.read more
Citations
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Journal ArticleDOI
Recent Developments in Sulfur-Containing Polymers
TL;DR: Sulfur-containing polymers fall under various classes and cover an extremely broad property range as discussed by the authors, and a lot of research efforts have been directed toward exploiting the special high-performance characteristics of polymers with sulfur in the backbone.
Journal ArticleDOI
Synthesis and characterization of new poly(azomethine ester)s having phenylthiourea units
TL;DR: In this article, a dihydroxy monomer N-(4-hydroxy-3methoxybenzal) N′-(4′-hydroxyphenyl)thiourea was condensed with six diacid chlorides.
Journal ArticleDOI
Synthesis and thermal behavior of novel poly(thiourea-amide)s derived from 1-(4-aminobenzoyl)-3- (3-aminophenyl) thiourea:
Ayesha Kausar,Ayesha Kausar,Sonia Zulfiqar,Sonia Zulfiqar,Muhammad Ishaq,Zahoor Ahmad,Muhammad Ilyas Sarwar +6 more
TL;DR: In this paper, a difunctional monomer, 1-(4-aminobenzoyl)-3-(3-aminophenyl) thiourea (ABAPT), was synthesized by the reduction of NBNPT (1-( 4-nitrobenzoyl), 3-( 3-nitrophenyl) and 3-aminoacetamide (3-acetamide), using spectroscopic and elemental analyses.
Dissertation
Synthesis And Characterization Of New Polyamides, Poly(Amide Imide)s, Polyimides And Polyurethanes Bearing Thiourea Moieties
TL;DR: In this paper, the effect of thiourea and other functional groups on the properties of newly synthesized polymers were scrutinized together with their structure-property relationship, and the results showed that the incorporation of different functional groups provides an opportunity to control certain physical properties such as solvent miscibility, ηinh, crystallinity, molecular weight, thermal stability and flame retardancy of the resulting polymers.
Journal ArticleDOI
High performance new heteroaromatic poly(thiourea-imide-ester)s: Synthesis and characterization
TL;DR: In this paper, a new dihydroxy monomer, 1-(2-hydroxypyridin-3-yl)-3-(2.5-carbonyl)thiourea, with preformed trimellitic anhydride chloride-derived imide ring, pyridine and C=S moieties was synthesized.
References
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Journal ArticleDOI
Charge Carrier Production and Mobility in Anthracene Crystals
TL;DR: The drift mobilities of electrons and holes in anthracene crystals have been measured using a pulsed photoconductivity technique as mentioned in this paper, and the results indicate that the charge carriers are not produced in the interior of the crystal, but that they are released from a surface layer of a crystal either directly by photons or by excitons which migrate to the surface.
Journal ArticleDOI
The semiconductivity of organic substances. Part 1
Journal ArticleDOI
Theory of Thermoelectric Power in Semiconductors with Applications to Germanium
TL;DR: In this article, the thermoelectric power of a semiconductor was derived by calculating the Thomson coefficient from electrical and thermal current density expressions and then integrating the relation of the relation to the Fermi level, forbidden band width, temperature, ratio of electron to hole mobility and effective electron and hole masses.
Journal ArticleDOI
On the Semiconductivity of Crystalline Aromatic Substances
A. Many,E. Harnik,D. Gerlich +2 more
Journal ArticleDOI
Photoconductivity of Anthracene. III
TL;DR: The photoconductivity of anthracene has been studied using three types of crystals: large scintillation crystals, crystals grown from dimethylformamide, and sublimation flakes.
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