Abstracts Book - IMRC 2018

• SD7-P035
DISPERSION OF CARBON NANOTUBES FOR EVALUATION OF
OZONE GAS SENSITIVITY
Selene Irais Capula Colindres 1 , Gerardo Teran Mendez 2 , Esther Torres 3
1 Instituto Politécnico Nacional - IPN, metallurgy, Mexico. 2 Instituto Politécnico Nacional - IPN,
metalurgia, Mexico. 3 Instituto Politécnico Nacional - IPN - ESIQIE, Química, Mexico.
Due to their electrical and mechanical properties, carbon nanotubes (CNT) are
considered ideal sensing materials for chemical sensors. Using CNT is possible
decrease dimension of device (portable), work at room temperature and low
power. It can detect a wide range of gases in-situ with effectively selectivity and
sensibility. Carbon nanotubes have a high number of Van der Waals
interactions, limiting in practical application because they present extremely
poor solubility in water and organic solvents. By employing techniques covalent
and non-covalent is possible increase dispersion of CNT. Covalent
functionalization changes the external surface of the tubes, this modification
can be affect their electrical and mechanical properties of the materials. Non
covalent treatment is attractive because the tubes show a minimum damage
and it is an easy procedure. This work presents a study of pristine multi-walled
carbon nanotubes (MWCNT) dispersed in various solvent and their sensitivity
response with ozone molecules. Sensitive materials and surfactant suspension
were dispersed using sonication at room temperature during one hour. Dropcoating
technique was used to deposit the suspensions on the substrate. The
best responses were found in nanotubes dispersed with glycerol and
isopropanol. These systems reported sensitivity ambient temperature up to 200
°C at various concentrations of ozone. Response sensitivity was directly
proportional to the concentrations evaluated. MWCNTs were characterized by
optical and transmission electron microscopy (TEM) and Raman spectroscopy.
Acknowledgment:
The authors thank CONACYT and SIP-IPN 20171187 for the financial support
Keywords: surfactant, carbon nanotubes, dispersion
Presenting authors email: selenecapula@gmail.com