Carbon nanotubes field effect transistors biosensors

pp 2-6

M.T. Martínez, Y.C. Tseng, N. Ormategui,  I. Loinaz, R. Eritja, J.P. Salvador, M.P. Marco, J. Bokor

ABSTRACT: Carbon nanotube transistor arrays (CNTFETs) were used as biosensors to detect NA hybridization and to recognize two anabolic steroids, stanozolol (Stz) and methylboldenone (MB). Single strand DNA and antibodies specific for STz and MB were immobilized on the carbon nanotubes (CNTs) in situ in the device using two different approaches: direct noncovalent bonding of antibodies to the devices and covalently trough a polymer previously attached to the CNTFETs. A new approach to ensure specific adsorption of the biomolecules to the nanotubes was developed. The polymer poly (methylmethacrylate_0.8-co-poly(ethyleneglycol)methacrylate_0.8-co-N-succinimidyl methacrylate_0.1) was synthesized and bonded noncovalently to the nanotube. Aminated single-strand DNA or antibodies specific for Stz and MB were then attached covalently to the polymer. Statistically significant changes were observed in key transistor parameters for both DNA hybridization and steroids recognition. Regarding the detection mechanism, in addition to charge transfer, Schottky barrier, SB, modification, and scattering potential reported by other authors, an electron/hole trapping mechanism leading to hysteresis modification has been determined. The presence of polymer seems to hinder the modulation of the electrode-CNT contact.

New Strategies for the Selective Functionalization of Carbon Materials

pp 7-12

M. Pérez-Mendoza

ABSTRACT: Selectively surface-modified solids can play a crucial role in the development of new materials devised to give effective answers to the new technology demands of the more sustainable 21^st-century industry. This has brought about a concentration of research efforts on the elaboration of specific chemical functionality on solid surfaces. Nevertheless, the introduction of specific surface functionalization on carbon materials has not yet realized the degree of sophistication and control that other solid materials have reached. This article reviews the latest research developed under the CARB-NANOMETAL project (at the Universities of Granada and Jaén) towards the designing of new strategies for the selective functionalization of carbon materials.

Interacciones As y Se con cenizas volantes

pp 13-17

M.A. López-Antón, M. Díaz-Somoano, M.R. Martinez-Tarazona

RESUMEN: El arsénico y el selenio son elementos tóxicos presentes en el carbón en concentraciones del orden de las trazas que pueden ser emitidos al medio ambiente durante los procesos de conversión del carbón. Sin embargo, los compuestos de arsénico y selenio pueden ser retenidos en las cenizas volantes originadas en el propio proceso en distintas proporciones dependiendo de las características de las cenizas y las condiciones del proceso. Este trabajo se centra en la captura de estos elementos en cenizas volantes en una atmósfera de combustión y gasificación de carbón en reactores a escala de laboratorio.

Structure and properties of carbon nanofibers. application as electrocatalyst support

pp 18-19

S. del Río

ABSTRACT: The present work aimed to gain an insight into the physical-chemical properties of carbon nanofibers and the relationship between those properties and the electrocatalytic behavior when used as catalyst support for their application in fuel cells

Electronic, mechanical and optical properties of atomically thin tow-dimensional crystals

pp 20-21

A. Castellanos-Gómez

ABSTRACT: This work is devoted to the study of electronic and mechanical properties of crystalline atomically thin two-dimensional sheets, such as graphene, MoS2, NbSe2 and mica by scanning probe microscopy.