Afm Tips
Mostrando 1-11 de 11 artigos, teses e dissertações.
-
1. Syntesis of Carbon Nanostructures Near Room Temperature Using Microwave PECVD
Carbon nanostructures (nanotubes, nanofibers and nanosponges) were synthesized onto Si (001) substrates using a microwave assisted plasma enhanced chemical vapor deposition (PECVD) from C2H2-Ar mixtures at low substrate temperatures (120 °C). Catalytic films (Ni and Cu) 3 nm thick were used. Different structures were formed, depending on the C2H2 partial pr
Mat. Res.. Publicado em: 2015-08
-
2. The use of functionalized AFM tips as molecular sensors in the detection of pesticides
Atomic force spectroscopy, a technique derived from Atomic Force Microscopy (AFM), allowed us to distinguish nonspecific and specific interactions between the acetolactate synthase enzyme (ALS) and anti-atrazine antibody biomolecules and the herbicides imazaquin, metsulfuron-methyl and atrazine. The presence of specific interactions increased the adhesion fo
Mat. Res.. Publicado em: 22/03/2013
-
3. Chemical Modifications of AFM Tips for the Study of Molecular Recognition Events / Modificação química de pontas de AFM para o estudo de eventos de reconhecimento molecular
Neste trabalho foram realizados experimentos para o desenvolvimento de procedimentos para a modificação de pontas de microscopia de força atômica (AFM), visando o estudo de eventos de reconhecimento molecular. Os resultados foram obtidos com as pontas de AFM e os substratos funcionalizados com 3-aminopropiltrietoxisilano (APTES) e, em seguida as biomolé
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/09/2010
-
4. CARACTERIZAÇÃO DE DEFEITOS MECÂNICOS PRODUZIDOS POR NANOINDENTAÇÃO NO INP / CHARACTERIZATION OF MECHANICAL DEFECTS PRODUCED BY NANOINDENTATION IN INP
In this thesis, the mechanical deformation mechanism of semiconductors III-V was studied, especially for InP. Defects were produced by indentations using an atomic force microscope and a Triboscope nanoindenter. The AFM tip torsion during indentation difficult the control and the reproducibility of AFM nanoindentation experiments. Nevertheless, the tip torsi
Publicado em: 2009
-
5. Síntese de nanotubos de carbono orientados e aplicação na produção de pontas de AFM / Oriented growth of carbon nanotubes and application in production of afm Tips
In this work multi walled carbon nanotubes (MWCNT) were obtained. The growth presented high density nanotubes oriented perpendicularly to the substrate, with about 20 m length and diameters between 20 and 60 nm. Catalytic films containing iron were used. These films were deposited from solution of iron nitrate (Fe(NO3)3.9H2O) in ethyl alcohol with concentrat
Publicado em: 2008
-
6. Silicon nano-oxidation using AFM tips. / Nano-oxidação do silício utilizando sonda de AFM.
Local anodic oxidation of silicon using Atomic Force Microscopy (AFM) was investigated by applying a negative voltage between silicon nitride tip and Si surfaces. All samples were cleaned with an ammonium-based solution known in literature as standard cleaning 1 (SC1) or a dip in a diluted hydrofluoric acid solution followed by SC1 or, also, boiling in isopr
Publicado em: 2007
-
7. Nanomanipulation and characterization of individual nano-objects for in situ experiments of electron microscopy / Nanomanipulação e caracterização de nano-objetos individuais por experimentos in situ de microscopia eletronica
It is expected that, in the future, high-technology devices should be based on new and unexpected physical and chemical properties of nanometric objects. Many applications require nano-objects to be selectively positioned at well-defined positions of a device. However, the well-established methods of physical manipulation used in the macroscopic scale are no
Publicado em: 2007
-
8. Processing and functionalization of tips for biologial applications of atomic force microscopy / Processamento e funcionalização de pontas para aplicações biologicas de microscopia de força atomica
Este trabalho teve como objetivo implementar a técnica de espectroscopia de força no Microscópio de Força Atômica (AFM) existente no LPD/IFGW/UNICAMP e aplicá-la ao estudo de pontas e amostras funcionalizadas com tiol (mercaptoundecanoic acid). Em particular, foi necessária uma caracterização minuciosa da ponta de AFM, utilizando imagens de microsco
Publicado em: 2005
-
9. Direct measurement of hydrogen bonding in DNA nucleotide bases by atomic force microscopy.
We have used self-assembled purines and pyrimidines on planar gold surfaces and on gold-coated atomic force microscope (AFM) tips to directly probe intermolecular hydrogen bonds. Electron spectroscopy for chemical analysis (ESCA) and thermal programmed desorption (TPD) measurements of the molecular layers suggested monolayer coverage and a desorption energy
-
10. Imaging biological structures with the cryo atomic force microscope.
It has long been recognized that one of the major limitations in biological atomic force microscopy (AFM) is the softness of most biological samples, which are easily deformed or damaged by the AFM tip, because of the high pressure in the contact area, especially from the very sharp tips required for high resolution. Another is the molecular motion present a
-
11. High-Resolution Scanning Tunneling Microscopy of Fully Hydrated Ripple-Phase Bilayers
A modified freeze-fracture replication technique for use with the scanning tunneling microscope (STM) has provided a quantitative, high-resolution description of the waveform and amplitude of rippled bilayers in the Pβ, phase of dimyristoylphosphatidylcholine (DMPC) in excess water. The ripples are uniaxial and asymmetrical, with a temperature-dependent amp