4473bc19766b2fea9b8a1d199558b658 pmc_34209427.pdf dedb1a952e61f3b5c75cb03ad59d79986225d42d pmc_34209427.pdf dd96c463b3b256a7f87b8d814f8109f6a568bda5e5e65876d8d962eb4deb2c79 pmc_34209427.pdf Title: ZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Properties Subject: Zinc oxide rod structures are synthetized and subsequently modified with Au, Fe2O3, or Cu2O to form nanoscale interfaces at the rod surface. X-ray photoelectron spectroscopy corroborates the presence of Fe in the form of oxide—Fe2O3; Cu in the form of two oxides—CuO and Cu2O, with the major presence of Cu2O; and Au in three oxidation states—Au3+, Au+, and Au0, with the content of metallic Au being the highest among the other states. These structures are tested towards nitrogen dioxide, ethanol, acetone, carbon monoxide, and toluene, finding a remarkable increase in the response and sensitivity of the Au-modified ZnO films, especially towards nitrogen dioxide and ethanol. The results for the Au-modified ZnO films report about 47 times higher response to 10 ppm of nitrogen dioxide as compared to the non-modified structures with a sensitivity of 39.96% ppm-1 and a limit of detection of 26 ppb to this gas. These results are attributed to the cumulative effects of several factors, such as the presence of oxygen vacancies, the gas-sensing mechanism influenced by the nano-interfaces formed between ZnO and Au, and the catalytic nature of the Au nanoparticles. Keywords: zinc oxide; gold; iron oxide; copper oxide; interfaces; Schottky junctions; heterojunctions; gas sensing; nitrogen dioxide Author: Milena Tomić, Martha Claros, Isabel Gràcia, Eduard Figueras, Carles Cané and Stella Vallejos Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Mon Jul 5 11:54:16 2021 CEST ModDate: Wed Jul 7 03:06:41 2021 CEST Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 24 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 11091941 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- MWJZGO+VnURWPalladioL-Bold Type 1 Custom yes yes no 10 0 SDIDBK+VnURWPalladioL Type 1 Custom yes yes no 15 0 TKLSGS+URWPalladioL-Ital Type 1 Custom yes yes no 19 0 UANSVT+URWPalladioL-Bold Type 1 Custom yes yes no 24 0 UYLAUD+URWPalladioL-Roma Type 1 Custom yes yes no 28 0 IIICNG+CMSY10 Type 1 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MAOPHH+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 511 0 MAOPNH+PalatinoLinotype TrueType WinAnsi yes yes no 514 0 MAOPOJ+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 517 0 MAOPHH+PalatinoLinotype,Bold TrueType WinAnsi yes yes no 532 0 MAOPNH+PalatinoLinotype TrueType WinAnsi yes yes no 535 0 MAOPOJ+PalatinoLinotype,Italic TrueType WinAnsi yes yes no 538 0 RIPJNU+EURM7 Type 1 Builtin yes yes no 555 0 Jhove (Rel. 1.22.1, 2019-04-17) Date: 2023-05-27 02:43:18 CEST RepresentationInformation: pmc_34209427.pdf ReportingModule: PDF-hul, Rel. 1.12.1 (2019-04-17) LastModified: 2023-03-31 12:14:24 CEST Size: 11091941 Format: PDF Version: 1.7 Status: Well-Formed and valid SignatureMatches: PDF-hul MIMEtype: application/pdf PDFMetadata: Objects: 796 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@44c8afef Item: Title: Materials and Methods Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7b69c6ba Item: Title: Results and Discussion Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@46daef40 Children: Item: Title: Gold-Modified Zinc Oxide Films Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@12f41634 Item: Title: Iron-Modified Zinc Oxide Films Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@13c27452 Item: Title: Copper-Modified Zinc Oxide Films Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@262b2c86 Item: Title: Gas Sensing Tests Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@371a67ec Item: Title: Gas Sensing Mechanism Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@5ed828d Children: Item: Title: Gold-Modified Zinc Oxide Films Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@50d0686 Item: Title: Iron- and Copper-Modified Zinc Oxide Films Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@7a3d45bd Item: Title: Conclusions Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@1e7c7811 Item: Title: References Destination: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject@77ec78b9 Info: Title: ZnO Structures with Surface Nanoscale Interfaces Formed by Au, Fe2O3, or Cu2O Modifier Nanoparticles: Characterization and Gas Sensing Properties Author: きどぬづのち〠ごはねどㅜ〰㝜〰〬〠きちひぴとち〠ぃぬちひはび〬〠ぉびちぢづぬ〠ぇひムっどち〬〠ぅつふちひつ〠うどでふづひちび〬〠ぃちひぬづび〠ぃちのラ〠ちのつ〠こぴづぬぬち〠ざちぬぬづなはび Subject: Zinc oxide rod structures are synthetized and subsequently modified with Au, Fe2O3, or Cu2O to form nanoscale interfaces at the rod surface. X-ray photoelectron spectroscopy corroborates the presence of Fe in the form of oxide Fe2O3; Cu in the form of two oxides CuO and Cu2O, with the major presence of Cu2O; and Au in three oxidation states Au3+, Au+, and Au0, with the content of metallic Au being the highest among the other states. These structures are tested towards nitrogen dioxide, ethanol, acetone, carbon monoxide, and toluene, finding a remarkable increase in the response and sensitivity of the Au-modified ZnO films, especially towards nitrogen dioxide and ethanol. The results for the Au-modified ZnO films report about 47 times higher response to 10 ppm of nitrogen dioxide as compared to the non-modified structures with a sensitivity of 39.96% ppm-1 and a limit of detection of 26 ppb to this gas. These results are attributed to the cumulative effects of several factors, such as the presence of oxygen vacancies, the gas-sensing mechanism influenced by the nano-interfaces formed between ZnO and Au, and the catalytic nature of the Au nanoparticles. Keywords: zinc oxide; gold; iron oxide; copper oxide; interfaces; Schottky junctions; heterojunctions; gas sensing; nitrogen dioxide Creator: LaTeX with hyperref Producer: pdfTeX-1.40.21 CreationDate: Mon Jul 05 11:54:16 CEST 2021 ModDate: Wed Jul 07 03:06:41 CEST 2021 ID: 0xaabe227f7dd539c15aca23bd6fe07590, 0xaabe227f7dd539c15aca23bd6fe07590 Filters: FilterPipeline: FlateDecode Fonts: Type1: Font: BaseFont: IIICNG+CMSY10 FontSubset: true FirstChar: 0 LastChar: 33 FontDescriptor: FontName: IIICNG+CMSY10 Flags: Symbolic FontBBox: -29, -960, 1116, 775 FontFile: true Font: BaseFont: IEVEFP+CMR10 FontSubset: true FirstChar: 40 LastChar: 43 FontDescriptor: FontName: IEVEFP+CMR10 Flags: Symbolic FontBBox: -40, -250, 1009, 750 FontFile: true Font: BaseFont: PNCBPL+EURM10 FontSubset: true FirstChar: 11 LastChar: 22 FontDescriptor: FontName: PNCBPL+EURM10 Flags: Symbolic FontBBox: -32, -243, 1060, 720 FontFile: true Font: BaseFont: TKLSGS+URWPalladioL-Ital FontSubset: true FirstChar: 2 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Subtype: Link Rect: 310, 433, 348, 444 Annotation: Subtype: Link Rect: 472, 410, 509, 421 Annotation: Subtype: Link Rect: 520, 387, 557, 398 Annotation: Subtype: Link Rect: 59, 365, 97, 375 Annotation: Subtype: Link Rect: 59, 342, 97, 352 Annotation: Subtype: Link Rect: 104, 319, 141, 329 Annotation: Subtype: Link Rect: 245, 295, 282, 306 Annotation: Subtype: Link Rect: 317, 272, 355, 283 Annotation: Subtype: Link Rect: 476, 261, 514, 272 Annotation: Subtype: Link Rect: 296, 238, 334, 249 Annotation: Subtype: Link Rect: 340, 238, 376, 249 Annotation: Subtype: Link Rect: 517, 215, 554, 226 Annotation: Subtype: Link Rect: 166, 192, 204, 203 Annotation: Subtype: Link Rect: 467, 169, 504, 180 Annotation: Subtype: Link Rect: 222, 146, 259, 157 Annotation: Subtype: Link Rect: 147, 112, 185, 122 Annotation: Subtype: Link Rect: 113, 89, 150, 99 Annotation: Subtype: Link Rect: 157, 89, 193, 99 Annotation: Subtype: Link Rect: 59, 66, 97, 76 Page: Sequence: 24 Annotations: Annotation: Subtype: 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