Baixe Propriedades elétricas de nanomateriais: Au-MSA e CNTs e outras Notas de estudo em PDF para Física, somente na Docsity! ELECTRICAL TRANSPORT THROUGH
SINGLE NANOPARTICLES
PRESENTED BY
PRASANTH
MIBIN BABU
JoJo NTE TWO
INTRODUCTION Electrical conduction properties of nanomaterials depends on the surface, interface and interior properties. Fig 5:A, B and C represent large area SEM images of SL(I), SL(II) and SL(III) showing the regular geometry of the 3-D SL crystals formed at the air–water interface. Insets show respective low angle XRD patterns. A1, B1 and C1 represent enlarged images of a 3-D SL crystal. A2, B2 and C2 represent high-resolution lattice resolved SEM images showing the hexagonal geometry of the building blocks in the 3-D SLs. Their insets show fast Fourier transform (FFT) images created using ImageJ software (top) Phys. Chem. Chem. Phys., 2009, 11, 9346–9350 Temperature dependence on the charge transport behaviour of 3-D superlattice crystals of mercaptosuccinic acid-protected gold nanoparticles Fig 6. A schematic representing the formation of network structures through intermolecular hydrogen bonding between the carboxylic acid groups of the monolayers in the 3-D SLs crystals. In addition to the intermolecular hydrogen bonding, there exist possibilities for intramolecular hydrogen bonding also, but these are not shown here for simplicity. Phys. Chem. Chem. Phys., 2009, 11, 9346–9350 Fig. 7 Variation of resistance of SL(I), SL(II) and SL(III) respectively, as a function of temperature. The dotted-square represents a transition process; the origin of which is not known at the moment. The inset shows an expanded trace of SL(III) in the 150–285 K. Phys. Chem. Chem. Phys., 2009, 11, 9346–9350 Figure 10. Temperature dependent resistivity measurements of PANI@Ag composites with different concentrations of the polymer, MW 100 kDa. Figure 11. Temperature dependent resistivity measurements of PANI@Ag composites with different concentrations of the polymer,MW 10 kDa. For comparison, the highest concentration data from Figure 10 i reproduced, as well as the data for the home- made pure silver. Adv. Funct. Mater. 2009, 19, 1293–1298 Figure 12. Concentration dependent resistivity measurements of PANI@Ag composites in two distinct temperatures. Trend lines were added. Adv. Funct. Mater. 2009, 19, 1293–1298 Electrical properties of cadmium selenide nanoparticle Figure:13 Variation of ln s (Ocm)1 with 1000/T(K1) for CdSe nanoparticles prepared at 160 1C. Physica B 403 (2008) 152–158 Variation of e0 with temperature for CdSe nanoparticles prepared at 160 1C at different frequencies. Variation of loss tangent tan(d) with temperature for CdSe nanoparticles prepared at 160 1C at different frequencies. CARBON NANOTUBES Carbon nanotubes (CNTs) are allotropes of carbon with a cylindrical nanostructure. They exhibit extraordinary strength and unique electrical properties, and are efficient thermal conductors. ELECTRICAL PROPERTIES OF METALLIC TUBES The conductivity of metallic nanotubes can be equal to, or even exceed, the conductivity of the best metals at room temperature. The effective density of states in nanotubes is much lower than traditional metals because of the semi-metallic nature of graphene. HIGH CONDUCTIVITY OF INDIVIDUAL CARBON NANOTUBE TO CARBON NANOTUBE REGROWTH JUNCTIONS • Carbon nanotubes (CNTs) can be used in future electronics both as interconnects and as functional elements. • In particular, CNTs have demonstrated higher electrical conductivity and current density than Cu . • Therefore CNTs are excellent for wiring in electronics circuits. Fig 16 : SEM image and I-V characteristics of an electrically connected CNT junction obtained REF: APPLIED PHYSICS LETTERS 95, 113108 (2009)
