Effect of metal catalysts or reduced graphene oxide on metal oxides semiconductors...
| Grant number: | 15/05916-9 |
| Support type: | Scholarships in Brazil - Master |
| Effective date (Start): | June 01, 2015 |
| Effective date (End): | February 28, 2017 |
| Field of knowledge: | Engineering - Materials and Metallurgical Engineering |
| Cooperation agreement: | Coordination of Improvement of Higher Education Personnel (CAPES) |
| Principal Investigator: | Diogo Paschoalini Volanti |
| Grantee: | Cecilia de Almeida Zito |
| Home Institution: | Instituto de Biociências, Letras e Ciências Exatas (IBILCE). Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. São José do Rio Preto , SP, Brazil |
Abstract The proposed research aims to evaluate the synergic effect of palladium (Pd) or reduced graphene oxide (RGO) in tin dioxide (SnO2) with well-defined crystal faces for detection of volatile organic compounds (VOCs) in humid atmosphere. The Pd-SnO2 structures will be obtained by deposition of Pd nanoparticles by direct anion exchange between the ligands of Pd complex with hydroxyl surface of SnO2, previously prepared by microwave-assisted hydrothermal method (HAM). It is expected that Pd promotes electronic and chemical sensitization to prevent hydroxyl adsorption on the surface of SnO2 sensor and therefore improve the low selectivity, slow response and disabling the sensor caused by the presence of water vapor. On the other hand, the RGO-SnO2 structures will be synthetized in one-step by HAM method from a solution containing graphene oxide and Sn4+ in controlled pH. The RGO will act as electron acceptor to facilitate interaction between SnO2 and VOCs via chemical interactions pi-pi type, in addition to increasing the interconnectivity among SnO2 particles. The main benefits of RGO consist in increasing the adsorption process, sensitivity, reversibility, and detection limits of the sensors by minimizing the undesirable effect of humidity. Both heterostructures types will be evaluated in the presence of different VOCS (e.g. acetone, ethanol and toluene) by conductometric measurement. As a challenge, the heterostrucutres will be tested in high relative humidity (e.g. 90 - 95%) similar to the human breathing conditions and thus it will be possible to obtain more sensitive devices compared to those described in the literature. Indeed, the materials studied may have potential to the development of new sensors for noninvasive diagnosis of diseases such as diabetes and lung cancer. This proposal has the support of FAPESP grant (nº 14/17343-0) (AU) | |