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    <title language="eng">A host–guest approach to ratiometric pH sensing using upconversion nanoparticles</title>
    <abstract language="eng">A new pH nanosensor based on β-NaYF4:Yb3+/Tm3+ upconversion nanoparticles functionalized with cyclodextrin and a pH-sensitive adamantane-modified nitrobenzoxadiazole dye (NBD-Ad).</abstract>
    <parentTitle language="eng">Nanoscale Advances</parentTitle>
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    <author>Ivo Rosenbusch</author>
    <author>Marylyn Setsuko Arai</author>
    <author>Fabio Rizzo</author>
    <author>Andrea S. S. de Camargo</author>
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