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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.


Imax/Idark ratio (where Imax is the maximum current obtained for each light-dark cycle and Idark is the current in dark condition) versus light power density F for Te/PMMA film in coplanar configuration
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Fig9: Imax/Idark ratio (where Imax is the maximum current obtained for each light-dark cycle and Idark is the current in dark condition) versus light power density F for Te/PMMA film in coplanar configuration

Mentions: In order to compare the photoconductivity measurements with the literature data concerning the coplanar configuration, the Imax/Idark ratio versus the light power density F is plotted in Fig. 9, where Imax = Iphmax + Idark is the maximum value of the current before turning off the light. The Imax/Idark ratio depends quasilinearly on F, and it is worth noting that Imax/Idark = 2.8 at F = 100 mW/cm2; thus, the Te/PMMA sample shows a good photosensitivity as in the case of films composed of tellurium nanorods immersed in polydimethylsiloxane [27].Fig. 9


Structural and Photoconductivity Properties of Tellurium/PMMA Films.

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

Imax/Idark ratio (where Imax is the maximum current obtained for each light-dark cycle and Idark is the current in dark condition) versus light power density F for Te/PMMA film in coplanar configuration
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig9: Imax/Idark ratio (where Imax is the maximum current obtained for each light-dark cycle and Idark is the current in dark condition) versus light power density F for Te/PMMA film in coplanar configuration
Mentions: In order to compare the photoconductivity measurements with the literature data concerning the coplanar configuration, the Imax/Idark ratio versus the light power density F is plotted in Fig. 9, where Imax = Iphmax + Idark is the maximum value of the current before turning off the light. The Imax/Idark ratio depends quasilinearly on F, and it is worth noting that Imax/Idark = 2.8 at F = 100 mW/cm2; thus, the Te/PMMA sample shows a good photosensitivity as in the case of films composed of tellurium nanorods immersed in polydimethylsiloxane [27].Fig. 9

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.