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Structural and Photoconductivity Properties of Tellurium/PMMA Films.

Carotenuto G, Palomba M, De Nicola S, Ambrosone G, Coscia U - Nanoscale Res Lett (2015)

Bottom Line: A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer.The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide.Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.

View Article: PubMed Central - PubMed

Affiliation: Institute for Polymers, Composites and Biomaterials, National Research Council, Piazzale E. Fermi 1, 80055, Portici, Naples, Italy.

ABSTRACT
Owing to the very brittle nature of tellurium powder, nanoscopic grains with an average size of 4.8 ± 0.8 nm were produced by dry vibration milling technique using a mixer/mill apparatus. A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer. The morphology, elemental composition, and structural and optical properties of Te/PMMA films were investigated. The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide. The electrical properties of the films were studied, for different electrode contact configurations, in dark condition and under white light illumination varying the optical power density from 2 to 170 mW/cm(2) and turning the light on and off cyclically. Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.

No MeSH data available.


FT-IR spectrum of a milled tellurium powder sample
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Fig3: FT-IR spectrum of a milled tellurium powder sample

Mentions: Some information on the structural properties of the milled powder was obtained by infrared spectroscopy. Indeed, the FT-IR spectrum of the milled tellurium sample shown in Fig. 3 includes the typical absorption bands of tellurium oxide centered at wavenumbers of 773 and 667 cm−1. According to the literature [26], these two resonances correspond to the symmetrical equatorial and asymmetrical axial stretching frequencies of the Te–O bonds, respectively. Furthermore, a quite broad and intensive absorption band due to the OH stretching vibrational mode, located at a wavenumber of 3436 cm−1, can be detected revealing that the oxide phase was partially hydrated.Fig. 3


Structural and Photoconductivity Properties of Tellurium/PMMA Films.

Carotenuto G, Palomba M, De Nicola S, Ambrosone G, Coscia U - Nanoscale Res Lett (2015)

FT-IR spectrum of a milled tellurium powder sample
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4526513&req=5

Fig3: FT-IR spectrum of a milled tellurium powder sample
Mentions: Some information on the structural properties of the milled powder was obtained by infrared spectroscopy. Indeed, the FT-IR spectrum of the milled tellurium sample shown in Fig. 3 includes the typical absorption bands of tellurium oxide centered at wavenumbers of 773 and 667 cm−1. According to the literature [26], these two resonances correspond to the symmetrical equatorial and asymmetrical axial stretching frequencies of the Te–O bonds, respectively. Furthermore, a quite broad and intensive absorption band due to the OH stretching vibrational mode, located at a wavenumber of 3436 cm−1, can be detected revealing that the oxide phase was partially hydrated.Fig. 3

Bottom Line: A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer.The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide.Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.

View Article: PubMed Central - PubMed

Affiliation: Institute for Polymers, Composites and Biomaterials, National Research Council, Piazzale E. Fermi 1, 80055, Portici, Naples, Italy.

ABSTRACT
Owing to the very brittle nature of tellurium powder, nanoscopic grains with an average size of 4.8 ± 0.8 nm were produced by dry vibration milling technique using a mixer/mill apparatus. A novel material was obtained by binding the nanosized tellurium grains with poly(methyl methacrylate) (PMMA) polymer. The morphology, elemental composition, and structural and optical properties of Te/PMMA films were investigated. The prepared material was composed of hexagonal tellurium and α-phase of tellurium oxide. The electrical properties of the films were studied, for different electrode contact configurations, in dark condition and under white light illumination varying the optical power density from 2 to 170 mW/cm(2) and turning the light on and off cyclically. Data analysis shows that the photoconductivity of the film with sandwich contact configuration is a linear function of the light power density and increases more than 2 orders of magnitude as compared to the photoresponse of the film with coplanar contact configuration.

No MeSH data available.