TITLE

Electrochemical differential photoacoustic cell to study in situ the growing process of porous materials

AUTHOR(S)
Gutiérrez, Adriana; Giraldo, Jairo; Velázquez-Hernández, Rubén; Mendoza-López, Maria Luisa; Espinosa-Arbeláez, Diego G.; del Real, Alicia; Rodríguez-García, Mario E.
PUB. DATE
January 2010
SOURCE
Review of Scientific Instruments;Jan2010, Vol. 81 Issue 1, p013901
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In order to study in situ the growing process of porous materials, a new electrochemical differential photoacoustic cell (DPC) was developed. This system allows to obtain the thermal signals coming from the growing process of the pores without the external noise component. The DPC is a good system to growth porous silicon and study their growing process with reproducibility. The porous silicon samples were obtained by using electrochemical etching of (100) n-type silicon wafers with different nominal resistivity values in the range of 1–25 Ω cm. The samples were formed in a solution of hydrofluoric acid and ethanol having a composition ratio of 1:1 in volume with etching voltage of 10V and an etching time of 2 min using back illumination provided by a laser beam with a wavelength of 808 nm. The porous samples were characterized by means of Raman microscopy, x-ray diffraction, and scanning electron microscopy. The crystallite sizes of the samples were obtained through the analysis of the micro-Raman spectra using a phonon confinement model, and the analysis of the x-ray diffractograms.
ACCESSION #
47807390

 

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