<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Malik, Monika</style></author><author><style face="normal" font="default" size="100%">Padhye, Preeti</style></author><author><style face="normal" font="default" size="100%">Poddar, Pankaj</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%"> Downconversion luminescence-based nanosensor for label-free detection of explosives </style></title><secondary-title><style face="normal" font="default" size="100%">Acs Omega</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style  face="normal" font="default" size="100%">FEB</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">4</style></volume><pages><style face="normal" font="default" size="100%">4259-4268</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;We report &lt;span class=&quot;hitHilite&quot;&gt;a&lt;/span&gt; selective and sensitive &lt;span class=&quot;hitHilite&quot;&gt;nanosensor&lt;/span&gt; probe based on polyethylenimine (PEI)-capped downconverting nanophosphors beta-NaYF4:Gd3+, Tb3+@PEI &lt;span class=&quot;hitHilite&quot;&gt;for&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;detection&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; 2,4,6-trinitrotoluene (TNT), &lt;span class=&quot;hitHilite&quot;&gt;both&lt;/span&gt; in water and buffer media. These downconverting phosphors were synthesized via &lt;span class=&quot;hitHilite&quot;&gt;a&lt;/span&gt; hydrothermal route and are known to show excellent chemical, thermal, and photostability. They emit sharp emission peaks centered at similar to 488, 544, 584, and 619 nm, among which &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; peak at similar to 544 nm was remarkably quenched (similar to 90%) &lt;span class=&quot;hitHilite&quot;&gt;by&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; addition &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; TNT without giving any new emission peak. &lt;span class=&quot;hitHilite&quot;&gt;The&lt;/span&gt; sensing mechanism is based on &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;formation&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;a&lt;/span&gt; Meisenheimer &lt;span class=&quot;hitHilite&quot;&gt;complex&lt;/span&gt; between &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;electron&lt;/span&gt;-rich amine-functionalized beta-NaYF4:Gd3+, Tb3+ nanophosphors and &lt;span class=&quot;hitHilite&quot;&gt;electron&lt;/span&gt;-deficient TNT molecule, which was prominently visualized &lt;span class=&quot;hitHilite&quot;&gt;by&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; change in &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; color &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; solution &lt;span class=&quot;hitHilite&quot;&gt;from&lt;/span&gt; whitish to brownish yellow, enabling visual &lt;span class=&quot;hitHilite&quot;&gt;detection&lt;/span&gt;, followed &lt;span class=&quot;hitHilite&quot;&gt;by&lt;/span&gt; luminescence resonance energy &lt;span class=&quot;hitHilite&quot;&gt;transfer&lt;/span&gt; between &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; nanophosphors and &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;complex&lt;/span&gt;. &lt;span class=&quot;hitHilite&quot;&gt;A&lt;/span&gt; linear range &lt;span class=&quot;hitHilite&quot;&gt;for&lt;/span&gt; TNT &lt;span class=&quot;hitHilite&quot;&gt;detection&lt;/span&gt; was obtained &lt;span class=&quot;hitHilite&quot;&gt;from&lt;/span&gt; 0.1 to 300 mu M &lt;span class=&quot;hitHilite&quot;&gt;with&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;a&lt;/span&gt; limit &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;detection&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;as&lt;/span&gt; low &lt;span class=&quot;hitHilite&quot;&gt;as&lt;/span&gt; 119.9 nM. This method displayed excellent selectivity toward TNT over other nitroaromatic compounds, which had no influence on &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;detection&lt;/span&gt;. Moreover, various other classes &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; analytes, viz., amino acids, pesticides, and sugars, did not quench &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; luminescence intensity &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; nanophosphors. This developed &lt;span class=&quot;hitHilite&quot;&gt;nanosensor&lt;/span&gt; probe possesses high, stable fluorescence brightness and capability &lt;span class=&quot;hitHilite&quot;&gt;for&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; selective and sensitive on-site recognition &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; TNT molecules in aqueous media, avoiding complicated strategies and instruments. Thus, this work promises to pave ways to many applications in &lt;span class=&quot;hitHilite&quot;&gt;the&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;detection&lt;/span&gt; &lt;span class=&quot;hitHilite&quot;&gt;of&lt;/span&gt; ultratrace analytes.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><work-type><style face="normal" font="default" size="100%">Article</style></work-type><custom3><style face="normal" font="default" size="100%">&lt;p&gt;Foreign&lt;/p&gt;
</style></custom3><custom4><style face="normal" font="default" size="100%">&lt;p&gt;&lt;span class=&quot;jhHeader_impact&quot;&gt;2.584&lt;/span&gt;&lt;/p&gt;
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