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conferenceseries.com
Volume 7, Issue 6 (Suppl) J Nanomed Nanotechnol
ISSN: 2157-7439 JNMNT, an open access journal Nanotek 2016
December 05-07, 2016
December 05-07, 2016 Phoenix, USA
13th International Conference on
Nanotek & Expo
J Nanomed Nanotechnol 2016, 7:6 (Suppl)
Polyelectrolyte nanocomposite membranes using imidazole- functionalized nanosilica for fuel ctell
applications
Elham Jafarnia
Sharif University Of Technology, IRAN
The preparation and characterization of a new type of nano composite polyelectrolyte membran TM(PEM), based on DuPont®
Nafion imidazole modified nanosilica (Im-Si), for Direct Methanol Fuel Cell (DMFC) applications is described. Related to the
interactions between the protonated imidazole groups, grafted on the surface of nanosilica, and negatively charged sulfonic acid groups
of Nafion, new electrostatic interactions can be formed in the interface of Nafion and Im- Si which result in both lower methanol
permeability and also higher proton conductivity. Physical characteristics of these manufactured nanocomposite membranes were
investigated by Scanning Electron Microscopy (SEM), Thermogravimetry Analysis (TGA), differential scanning calorimetry (DSC),
Fourier Transform Infrared spectroscopy (FTIR), water uptake, methanol permeability and ion exchange capacity, as well as proton
conductivity. The Nafion/Im-Si membranes showed higher proton conductivity, lower methanol permeability and, as a consequence,
higher selectivity parameter in comparison to the neat Nafion or Nafion/silica membranes. The obtained results indicated that the
Nafion/Im-Si membranes could be utilized as promising polyelectrolyte membranes for direct methanol fuel cell applications.
Fabrication of different types of TiO2 nanostructures and their gas sensing features
Erdem Sennik
Gebze Technical University, Turkey
In the last decades, metal oxides have been studied for some application areas such as solar cells, photocatalysts, and batteries.
Nano-sized metal oxides are especially utulized more actively in the following fields; piezoelectric materials, optoelectronic devices,
solar energy, and gas sensors. In case of fabricated metal oxide nanomaterials, the extraordinarily large surface-to-volume ratio
leads to a dominant surface effect due to the increase of specific surface. Hence, high surface area results in the enhancement of
the surface related properties such as catalytic activity or surface adsorption. Metal oxides such as zinc oxides, titanium oxides, and
tin oxides are the most used nano-sized gas sensor. Among metal oxide-based gas sensors, TiO2 has excellent sensing properties
for various gases such as H2, VOCs, NO2, and CO. To improve their gas sensing properties such as sensitivity, response time and
working temperature, metal oxides can be modified with different metals. In our study, TiO2 nanotubes, nanowires and nanorods
were fabricated by anodization and hydrothermal methods. Fabricated TiO2 nanomaterials have 40-90 nm in diameters and 0.5-40
µm in length. We also achieved to modify TiO2 nanomaterials with catalytic metal materials by some methods such as hydrothermal,
cathodization and CVD. Gas sensing properties of pristine and metal-functionalized TiO2 nanomaterials were investigated under dry
air flow at the temperature range from 30 °C to 200 °C. The results revealed that the TiO2 nanomaterials modified with metal materials
exhibited excellent sensing performance to gases, especially H2 even at room temperature, and also appropriate sensor behavior with
clear response-recovery.