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HCHO sensors are therefore of paramount importance for timely detection in daily life. However, existing sensors do not meet the stringent performance targets, while deactivation due to sensing detection at room temperature, for example, at extremely low concentration of formaldehyde (especially lower than 0.08\u2009ppm), is a widely unsolved problem. Herein, we present the Ag nanoparticles (Ag NPs) sensitized dispersed In<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> nanograin via a low-fabrication-cost hydrothermal strategy, where the Ag NPs reduces the apparent activation energy for HCHO transporting into and out of the In<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> nanoparticles, while low concentrations detection at low working temperature is realized. The pristine In<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> exhibits a sluggish response (R<jats:sub>a<\/jats:sub>\/R<jats:sub>g<\/jats:sub> = 4.14 to 10\u2009ppm) with incomplete recovery to HCHO gas. After Ag functionalization, the 5%Ag-In<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> sensor shows a dramatically enhanced response (135) with a short response time (102\u2009s) and recovery time (157\u2009s) to 1\u2009ppm HCHO gas at 30\u2009\u00b0C, which benefits from the Ag NPs that electronically and chemically sensitize the crystal In<jats:sub>2<\/jats:sub>O<jats:sub>3<\/jats:sub> nanograin, greatly enhancing the selectivity and sensitivity.<\/jats:p>","DOI":"10.1186\/s11671-019-3213-6","type":"journal-article","created":{"date-parts":[[2019,12,5]],"date-time":"2019-12-05T15:02:49Z","timestamp":1575558169000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":49,"title":["Ag Nanoparticles Sensitized In2O3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperature"],"prefix":"10.1186","volume":"14","author":[{"given":"Shiqiang","family":"Zhou","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mingpeng","family":"Chen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingjie","family":"Lu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yumin","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jin","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bo","family":"Li","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haitang","family":"Wei","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jicu","family":"Hu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Huapeng","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingju","family":"Liu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2019,12,5]]},"reference":[{"key":"3213_CR1","doi-asserted-by":"publisher","first-page":"37","DOI":"10.1016\/j.jhazmat.2014.11.024","volume":"285","author":"J Bartzis","year":"2015","unstructured":"Bartzis J, Wolkoff P, Stranger M, Efthimiou G, Tolis EI, Maes F, Norgaard AW, Ventura G, Kalimeri KK, Goelen E, Fernandes O (2015) On organic emissions testing from indoor consumer products\u2019 use. 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