| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2014) | |
| Nanomaterials | Tuesday Sessions |
| Session NM-TuP |
| Session: | Nanomaterials Poster Session |
| Presenter: | HugoR. Navarro Contreras, Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología (CIACyT-UASLP), Mexico |
| Authors: | G. Garcia Valdivieso, Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología (CIACyT-UASLP), Mexico H.R. Navarro Contreras, Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología (CIACyT-UASLP), Mexico F.J. González, Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología (CIACyT-UASLP), Mexico M. Quintana Ruiz, Instituto de Física (IF-UASLP), Mexico G. Vera Reveles, Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología (CIACyT-UASLP) |
| Correspondent: | Click to Email |
The objective of this work is to report on a study on the preparation of bolometers and their characterization, based on parallel linear arrays of carbon nanotubes (CNTs).
The CNTs present good thermal and electrical properties. That is the reason why they may constitute competitive bolometric devices. A bolometer is a device that absorbs energy, in our case infrared radiation, thus varying its temperature (increasing) and electrical resistance (decreasing). The figure of merit of the bolometers is the temperature coefficient of resistance (TCR).
With the objective of obtaining aligned arrays of CNTs we made a solution in water with polymer (PVP), surfactant (SDBS) and CNTs. For a second group Functionalization was also performed with amino groups (Thymine) to induce better alignment, taking advantage of the hydrogen bonds that form between them.
For both sets of prepared CNT’s copper was evaporated on them to have proper ohmic metal contacts to characterize the bolometers thus created.
The samples morphology and alignment were characterized by Scanning Electron Microscopy (SEM). Kaiser Test was performed to check on the degree of functionalization. The TCR of the constructed bolometers was electrothermally measured.
The results obtained with SEM were in some case alignments as long as 3 mm in length. The functionalization degree obtained was 1100 µmol/g. We obtain values of TCR in the range of -1.7 to -3.0 % K-1 for non-functionalized CNTs and from -0.4 to -5.4% K-1 for functionalized CNT’s.These last values are the largest reported for CNTs so far in the literature.
The authors acknowledge the financial support from Consejo Nacional de Ciencia y Tecnología (CONACyT) México, through grant 09-133428, CB-166014, Project CeMIESol 22 from FRC-UASLP, and the access to Laboratorio Nacional de Análisis Físicos, Químicos y Biológicos-UASLP, during the course of this research. MGGV acknowledges the financial support of CONACYT through a Ph.D. scholarship 422974/259064.