[labnetwork] Cleaning the Surface of ZnO

[Mohamed Ghoneim]

 I wanted to add that I used RF Sputtering at room temperature from a ZnO
target with 99.99% purity and Ar:O2 flow with the ratio of 2:1, if you can
provide any suggestions for improving the film quality that would be great.

Thanks again and wish you all a great day!

Mohamed T. Ghoneim
<https://scholar.google.com/citations?hl=en&user=-5mNcfYAAAAJ&view_op=list_works&sortby=pubdate>
,
Postdoctoral Researcher
MIT Media Lab, Building E-15, Fourth Floor, Room 443g.
Website
<https://sites.google.com/view/mtghoneim>

On Mon, Jan 29, 2018 at 10:31 AM, Mohamed Ghoneim <
mohamed.t.ghoneim at gmail.com> wrote:

> Dear All,
>
> I am sputtering ZnO thin films for pH sensing. Getting repeatable and
> stable results is a challenge that I though first has to do with chemical
> fouling and other selectivity issues but based on the literature these
> issues are there for ZnO but usually do not affect the reliability of
> measurements to a great extent. I am more concerned now about the
> crystallinity and stoichiometry effects and as well as surface cleaning
> techniques to make sure I do not have contaminants on the surface that
> significantly affects the surface chemistry.
> These are the XRD results of the films (x-axis is 2Theta and the blue
> (XYZ) are for ZnO:
> [image: Inline image 1]
> These are the XPS results of the films (the blue one is the as-deposited
> ZnO and the red one is after some tests in buffer solutions):
> [image: Inline image 2]
>
> Can you please share thoughts about the effect of (a) Crystalline
> Structure and (b) Stoichiometry (or elemental composition) of ZnO thin film
> on its pH sensing capabilities and how it affects the surface integrity in
> terms of: 1- Sensitivity 2- Repeatability 3- Stability of the Measurments.
> All thoughts, comments are highly appreciated,
> Thanks in advance and wish you a great day!
>
>
> Mohamed T. Ghoneim
> <https://scholar.google.com/citations?hl=en&user=-5mNcfYAAAAJ&view_op=list_works&sortby=pubdate>
> ,
> Postdoctoral Researcher
> MIT Media Lab, Building E-15, Fourth Floor, Room 443g.
> Website
> <https://sites.google.com/view/mtghoneim>
>
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