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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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            MA<span style="mso-spacerun:yes">  </span>02138<o:p></o:p></span></p>
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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">
      <meta http-equiv="Content-Type" content="text/html;
        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
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
            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"><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
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
            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"><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
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
            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"><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
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
            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"><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
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
            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
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
            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"><span
              style="font-size:0.875rem"><br>
            </span></div>
          <div class="gmail-nova-e-text gmail-nova-e-text--size-m
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
            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"><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
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
            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
            gmail-nova-e-text--family-sans-serif
            gmail-nova-e-text--spacing-s
            gmail-nova-e-text--color-inherit gmail-redraft-text"
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>
        <div><br>
        </div>
        <div><br clear="all">
          <div>
            <div class="gmail_signature"
              data-smartmail="gmail_signature">
              <div dir="ltr">
                <div>
                  <div dir="ltr">
                    <div dir="ltr">
                      <div dir="ltr">
                        <div dir="ltr">
                          <div dir="ltr">
                            <div dir="ltr">
                              <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>
                                <div><span style="font-size:12.8px"><a
                                      moz-do-not-send="true"
href="https://urldefense.proofpoint.com/v2/url?u=https-3A__sites.google.com_view_mtghoneim&d=DwMFaQ&c=WO-RGvefibhHBZq3fL85hQ&r=TEMLD8-VsxCGtcVzmvpT5GFNSczskEKHzW6aYlttmIY&m=bVSGBkFEqsSawg8pHJO_jnQJeur_F7n5vs7oe4cALzU&s=-57KMBniKU-tS8awvWypKA3mktsoIBITMHCkn08uJUs&e="
                                      target="_blank">Website<br>
                                    </a></span><br>
                                </div>
                              </div>
                            </div>
                          </div>
                        </div>
                      </div>
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      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
labnetwork mailing list
<a class="moz-txt-link-abbreviated" href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a>
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</pre>
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