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<font face="Times New Roman, Times, serif">Hi Mohamed,<br>
<br>
I don't know about the details of ZnO for pH sensing, but just an
fyi, ALD ZnO is particularly pure, and can be deposited at a range
of temperatures, which might allow your to modulate your
sensing/stability response. The stoichiometry for ALD films can
be expected to be very precise, and stable over a range of
deposition temperatures. ALD is available at Harvard CNS.<br>
<br>
For resistivity of the deposited film, we have found that an
anneal helps to stabilize the film. This might also help to
stabilize your pH response in your sputtered film. From what I
know about reactively sputtered oxides, their stoichiometry is
pretty sensitive to process conditions, which would presumably
lead to sample-to-sample variability in your pH measurements.<br>
<br>
<br>
Mac<br>
<br>
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<br>
On 1/29/2018 10:31 AM, Mohamed Ghoneim wrote:
<blockquote
cite="mid:CAJbcvZR3RFC7vTu8L86E3xamzarwQhzak7NzEgcU54++6GbpOg@mail.gmail.com"
type="cite">
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charset=ISO-8859-1">
<div dir="ltr">Dear All,
<div><br>
</div>
<div>
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="border:0px;text-transform:none;display:block;margin:0px
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15px;padding:0px;color:rgb(17,17,17);font-weight:400;font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:left;text-indent:0px;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span
style="font-size:0.875rem">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.</span></div>
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="border:0px;text-transform:none;display:block;margin:0px
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15px;padding:0px;color:rgb(17,17,17);font-weight:400;font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:left;text-indent:0px;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span
style="font-size:0.875rem">These are the XRD results of
the films (x-axis is 2Theta and the blue (XYZ) are for
ZnO:</span></div>
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="border:0px;text-transform:none;display:block;margin:0px
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15px;padding:0px;color:rgb(17,17,17);font-weight:400;font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:left;text-indent:0px;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span
style="font-size:0.875rem"><img
src="cid:part1.09080501.00010407@cns.fas.harvard.edu"
alt="Inline image 1" style="margin-right: 0px;"
height="248" width="544"><br>
</span></div>
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="border:0px;text-transform:none;display:block;margin:0px
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15px;padding:0px;color:rgb(17,17,17);font-weight:400;font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:left;text-indent:0px;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span
style="font-size:0.875rem">
<span
style="color:rgb(17,17,17);font-family:Roboto,Arial,sans-serif;font-size:14px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:left;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"></span></span></div>
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-decoration-style:initial;text-decoration-color:initial;border:0px;display:block;margin:0px
0px
15px;padding:0px;color:rgb(17,17,17);font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;text-align:left;background-color:rgb(255,255,255)"><span
style="font-size:0.875rem">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):</span></div>
<img src="cid:part2.06040205.02000804@cns.fas.harvard.edu"
alt="Inline image 2" height="332" width="544"><br
class="gmail-Apple-interchange-newline">
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="border:0px;text-transform:none;display:block;margin:0px
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15px;padding:0px;color:rgb(17,17,17);font-weight:400;font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:left;text-indent:0px;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span
style="font-size:0.875rem"><br>
</span></div>
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="border:0px;text-transform:none;display:block;margin:0px
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15px;padding:0px;color:rgb(17,17,17);font-weight:400;font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:left;text-indent:0px;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span
style="font-size:0.875rem">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: </span><span
style="font-size:0.875rem">1- Sensitivity </span><span
style="font-size:0.875rem">2- Repeatability </span><span
style="font-size:0.875rem">3- Stability </span><span
style="font-size:0.875rem">of the Measurments.</span></div>
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="border:0px;text-transform:none;display:block;margin:0px
0px
15px;padding:0px;color:rgb(17,17,17);font-weight:400;font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:left;text-indent:0px;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">All
thoughts, comments are highly appreciated,</div>
<div class="gmail-nova-e-text gmail-nova-e-text--size-m
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style="border:0px;text-transform:none;display:block;margin:0px;padding:0px;color:rgb(17,17,17);font-weight:400;font-family:Roboto,Arial,sans-serif;font-size:0.875rem;line-height:1.3;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;letter-spacing:normal;text-align:left;text-indent:0px;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">Thanks
in advance and wish you a great day!</div>
</div>
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<div dir="ltr"><a moz-do-not-send="true"
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__scholar.google.com_citations-3Fhl-3Den-26user-3D-2D5mNcfYAAAAJ-26view-5Fop-3Dlist-5Fworks-26sortby-3Dpubdate&d=DwMFaQ&c=WO-RGvefibhHBZq3fL85hQ&r=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=bVSGBkFEqsSawg8pHJO_jnQJeur_F7n5vs7oe4cALzU&s=WJcNu45WUbGNqMM8-c7UzH3tLW2FC5LJhwFT8-lyQZE&e="
target="_blank">Mohamed T. Ghoneim</a>,
<div>Postdoctoral Researcher</div>
<div><span style="font-size:12.8px">MIT </span>Media
Lab, Building E-15, Fourth Floor, Room
443g.</div>
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target="_blank">Website<br>
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