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2 results on '"Chew, K Y"'

1. High resolution front-side visualization of charge stored in EEPROM with scanning nonlinear dielectric microscopy (SNDM).

Author

Zeng, X M, Liu, Q, Tay, J Y, Chew, K Y, Cheah, J, and Gan, C L

Subjects
DIELECTRICS, VISUALIZATION, MICROSCOPY, CELL anatomy
Abstract

By exposing floating gates of EEPROM memory cells with frontside sample preparation, scanning nonlinear dielectric microscopy (SNDM) succeeded in reading back the data stored in the memory cells with a 250 nm node size. At an optimized voltage bias of AC = 3 V and DC = 1 V, a clear signal contrast between programmed and erased cells is obtained. The high resolution SNDM signal reveals the details of bowling-pin shape structure of memory cells, providing high confidence in data assignment during forensic applications. Such high resolution also makes SNDM a promising technique for newer generation devices with smaller node size. [ABSTRACT FROM AUTHOR]

Published
2021
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2. Effects of sodium doping on phase composition and morphology of barium titanate particles.

Author

Chew, K. Y., Bakar, M. Abu, and Bakar, N. H. H. Abu

Subjects
SODIUM, BARIUM, TITANATES, NANOPARTICLES, TITANIUM oxides synthesis, PHASE transitions, AGGLOMERATION (Materials), PARTICLE size distribution
Abstract

Tetragonal barium titanate (BaTiO3) was synthesized via sol-gel method and calcined at 900 °C. The crystal phase of barium titanate still remained after doping with sodium showing that the phase had not been distorted by dopants. However, an additional phase of sodium barium titanium oxide (Na1.7Ba0.45Ti5.85O13) was detected and is believed to be formed on the surface of particles. Surface microstructures of undoped BaTiO3 show no distinct shape and high agglomeration. These preparations described the effects of different calcination duration on the composition and shape and size of BaTiO3 particles. Upon doping with sodium, the morphology of the particles becomes distinct. However, with the effect of increasing calcination duration from 2 to 6 hours, the morphology of particles progressively transformed from cube to sphere. Particles agglomeration was still unavoidable. The average size of the particles varied slightly between 0.24 - 0.36 μm with narrow size distribution after calcination. [ABSTRACT FROM AUTHOR]

Published
2012
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