PROIMI   05436
PLANTA PILOTO DE PROCESOS INDUSTRIALES MICROBIOLOGICOS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
ZnO Nanowires: Growth, Properties and their Application in Devices
Autor/es:
REAL, SILVINA; ALASTUEY, PATRICIO; TOSI EZEQUIEL; TIRADO, MONICA; REAL, SILVINA; ALASTUEY, PATRICIO; TOSI EZEQUIEL; TIRADO, MONICA; VEGA, NADIA; ESPÍNDOLA, OMAR; JEREZ, CECILIA; MARIN, OSCAR; VEGA, NADIA; ESPÍNDOLA, OMAR; JEREZ, CECILIA; MARIN, OSCAR; GRINBLAT, GUSTAVO; ZELAYA, PRISCILA; CARRILLO, MIGUEL; COMEDI, DAVID; GRINBLAT, GUSTAVO; ZELAYA, PRISCILA; CARRILLO, MIGUEL; COMEDI, DAVID
Lugar:
Port Louis
Reunión:
Encuentro; 5th EMN Mauritius Meeting 2019: Computation and Theory & Nanowires; 2019
Institución organizadora:
International Conference on Energy, Materials and Nanotechnology (EMN); Université d´avant-garde (INRS) and Institute of Fundamental and Frontier Sciences: UESTC
Resumen:
Zinc Oxide (ZnO) is an n-type semiconductor with exceptional properties when compared to other direct band gap semiconductors, for instance a large exciton binding energy of ~60 meV and a band gap width in the UV of ~3.3 eV. ZnO crystallizes in the hexagonal structure of wurtzite, composed of monoatomic planes of tetrahedrally coordinated O2- or Zn2+ that alternate along the axis of hexagonal symmetry (c). This property leads into faster growth along that axis, originating elongated nanostructures of nanorod or nanowire type, which make it potentially useful for the design of different nanotechnological devices. In particular, ZnO nanowires have many promising innovative applications in different fields, such as photonics [1], spintronics [2] and optoelectronics [3].It is well known that a large number of the nanomaterial properties depend not only on their size, but also sensitively on their surface states. ZnO nanowires are no exception, and hence we have been devoting efforts to understanding and controlling their optical, electrical and chemical properties through the modification of their surfaces with different materials, such as oxide dielectrics (e.g. MgO, see fig.1a), enzymes (e.g. glucose oxidase see fig.1b) and photosensitizers, such as ruthenium polypyridyl complexes, among others. Fig 1. Lateral view (scanning electron micrograph) of ZnO nanowires grown on Si substrates: a) by hydrothermal method with conformal MgO coating which were grown on the nanowires by vapour transport deposition; b) by vapour transport deposition with conformal glucose oxidase coating by drop deposition.In this work, we describe surface modification procedures that have been implemented by our group for efficient control of electron transport, transfer and recombination processes at the nanowire surfaces, and hence optical emission and absorption, and nanowire functionalization. Understanding these processes is very important for their utilization in devices based on ZnO nanowires, such as UV sensors, biosensors, solar cell electrodes and light emitting devices (LEDs) [4-6].1.G. Grinblat, M. Rahmani, E. Cortés, M. Caldarola, D. Comedi, S. Maier, A. Bragas, Nano Lett., 14(11):6660-6665 (2014).2.Y. Tian, S. Bakaula, T. Wu, Nanoscale, 4, 1529-1540 (2012).3.M. Willander, Advances and Applications. Jenny Stanford Publishing, New York, USA (2013).4.N.C. Vega, O. Marin, E. Tosi, G. Grinblat, E. Mosquera, M.S. Moreno, M. Tirado, D. Comedi, Nanotechnology, 28, 275702 (2017). 5.N.C. Vega, J.H. Mecchia Ortiz, M. Tirado, N. Katz, D. Comedi, Mater. Res. Express, 5, 075020 (2018).6. P. Gallay, E. Tosi, R. Madrid, M. Tirado, D. Comedi, Nanotechnology, 27, 425501 (2016).