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Here, we present a highly selective, tunable, ultra\u2010stable, and ultra\u2010sensitive NO\n                    <jats:sub>2<\/jats:sub>\n                    sensor derived from gold nano\u2010islands (GNIs) and quantum dot (QD) assemblies anchored on a reactive sodium aluminophosphosilicate glass matrix (H1\u2010glass). Thermal dewetting of sputtered Au films at 550\u00b0C under ambient conditions initiates a reactive glass\u2010metal interaction (RGMI), leading to the formation of Au\u2010rich core\/semiconducting shell GNIs along with spatially dispersed QDs on the glass surface. Magnetometry and magnetic force microscopy reveal the emergence of room\u2010temperature ferromagnetism across the GNI array. The resulting H1\u2010Au sensor, featuring robustly embedded GNIs and QDs, demonstrates an exceptional chemiresistive response of 73.5% toward 40\u00a0ppm NO\n                    <jats:sub>2<\/jats:sub>\n                    , with a remarkable detection limit of 50 ppb, and maintains full functionality at temperatures down to 0\u00b0C. Notably, the synergistic application of external magnetic fields and light irradiation further amplifies the sensor response to 11.67% at an ultralow concentration of 50 ppt NO\n                    <jats:sub>2<\/jats:sub>\n                    , outperforming all previously reported chemiresistive gas sensing platforms. These findings establish RGMI\u2010stabilized GNIs as a highly reliable and versatile platform for ultra\u2010trace, low\u2010temperature gas detection, with broad implications for chemical, environmental, and biomedical monitoring applications.\n                  <\/jats:p>","DOI":"10.1002\/smll.75971","type":"journal-article","created":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T16:27:17Z","timestamp":1790526437000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Magneto\u2010Photoactivated Gold Plasmonic Nano\u2010Islands and Quantum Dot Assemblies for ppt\u2010Level NO\n                    <sub>2<\/sub>\n                    Detection"],"prefix":"10.1002","author":[{"given":"Pratyasha","family":"Rudra","sequence":"first","affiliation":[{"name":"CSIR\u2010Central Glass and Ceramic Research Institute  Kolkata West Bengal India"},{"name":"Academy of Scientific and Innovative Research (AcSIR)  Ghaziabad Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Indrajeet","family":"Mandal","sequence":"additional","affiliation":[{"name":"School of Interdisciplinary Research Indian Institute of Technology Delhi  New Delhi Delhi India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Renqian","family":"Zhou","sequence":"additional","affiliation":[{"name":"Division of Physical Science and Engineering Center for Renewable Energy and Storage Technologies (CREST) King Abdullah University of Science and Technology  Thuwal Kingdom of Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Soupitak","family":"Pal","sequence":"additional","affiliation":[{"name":"CSIR\u2010Central Glass and Ceramic Research Institute  Kolkata West Bengal India"},{"name":"Academy of Scientific and Innovative Research (AcSIR)  Ghaziabad Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ananya","family":"Nandi","sequence":"additional","affiliation":[{"name":"CSIR\u2010Central Glass and Ceramic Research Institute  Kolkata West Bengal India"},{"name":"Academy of Scientific and Innovative Research (AcSIR)  Ghaziabad Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Velaga","family":"Srihari","sequence":"additional","affiliation":[{"name":"High Pressure &amp;Synchrotron Radiation Physics Division Bhabha Atomic Research Centre  Mumbai Maharashtra India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sandip","family":"Bysakh","sequence":"additional","affiliation":[{"name":"CSIR\u2010Central Glass and Ceramic Research Institute  Kolkata West Bengal India"},{"name":"Academy of Scientific and Innovative Research (AcSIR)  Ghaziabad Uttar Pradesh India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kusampal","family":"Yadav","sequence":"additional","affiliation":[{"name":"School of Physical Sciences Indian Association for the Cultivation of Science  Kolkata West Bengal India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Prathamesh","family":"Deshmukh","sequence":"additional","affiliation":[{"name":"UGC\u2010DAE Consortium for Scientific Research, Mumbai Centre Bhabha Atomic Research Centre  Mumbai Maharashtra India"},{"name":"Savitribai Phule Pune University  Pune Maharashtra India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Devajyoti","family":"Mukherjee","sequence":"additional","affiliation":[{"name":"School of Physical Sciences Indian Association for the Cultivation of Science  Kolkata West Bengal India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eswaraiah","family":"Varrla","sequence":"additional","affiliation":[{"name":"Sustainable Nanomaterials and Technologies Lab Department of Physics and Nanotechnology SRM Institute of Science and Technology Kattankulathur Chengalpattu Tamil Nadu India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"N. 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