באתרו הסינתזה של זהב חלקיקים ללא צבירה במרחב Interlayer של סרטים שקופים Titanate Layered
Summary
כאן, אנו מציגים פרוטוקול לסינתזה באתרו של חלקיקי זהב (AuNPs) בתוך מרחב interlayer של סרטי titanate שכבתיים ללא הצבירה של AuNPs. אין שינוי ספקטרלי נצפה גם לאחר 4 חודשים. החומר המסונתז יש לצפות יישומי קטליזה, צילום-קטליזה, לבין ההתפתחות של מכשירי plasmonic חסכוניים.
Abstract
Combinations of metal oxide semiconductors and gold nanoparticles (AuNPs) have been investigated as new types of materials. The in situ synthesis of AuNPs within the interlayer space of semiconducting layered titania nanosheet (TNS) films was investigated here. Two types of intermediate films (i.e., TNS films containing methyl viologen (TNS/MV2+) and 2-ammoniumethanethiol (TNS/2-AET+)) were prepared. The two intermediate films were soaked in an aqueous tetrachloroauric(III) acid (HAuCl4) solution, whereby considerable amounts of Au(III) species were accommodated within the interlayer spaces of the TNS films. The two types of obtained films were then soaked in an aqueous sodium tetrahydroborate (NaBH4) solution, whereupon the color of the films immediately changed from colorless to purple, suggesting the formation of AuNPs within the TNS interlayer. When only TNS/MV2+ was used as the intermediate film, the color of the film gradually changed from metallic purple to dusty purple within 30 min, suggesting that aggregation of AuNPs had occurred. In contrast, this color change was suppressed by using the TNS/2-AET+ intermediate film, and the AuNPs were stabilized for over 4 months, as evidenced by the characteristic extinction (absorption and scattering) band from the AuNPs.
Introduction
חלקיקי מתכת אצילה שונים (MNPs) להפגין צבעים או גווני מאפיין בשל תהודת plasmon המשטח המקומית שלהם נכסים (LSPR); ובכך, ניתן להשתמש MNPs ביישומים אופטיים ו / או פוטו שונים 1-4. לאחרונה, שילובים של מוליכים למחצה תחמוצת מתכת (MOS) photocatalysts, כגון תחמוצת טיטניום (Tio 2) ו MNPs, נחקרו ביסודיות כמו סוגים חדשים של photocatalysts 5-14. עם זאת, במקרים רבים, כמויות קטנות מאוד של MNPs להתקיים על פני שטח MOS, כי רוב חלקיקי MOS יש שטח פנים נמוך יחסית. מצד שני, מוליכים למחצה תחמוצת מתכת שכבתית (LMOSs) להפגין תכונות photocatalytic ויש להם שטח פנים גדול, בדרך כלל כמה מאות מטרים רבועים לכל גרם יחידה של LMOS 15-17. בנוסף, LMOSs השונה בעלי תכונות עיבור (כלומר, לתרכובות כימיות שונות ניתן לאכלס בתוך חללי interlayer להרחבה והגדולים שלהם) 15-20. לפיכך, עם שילוב של MNPs ו LMOSs, צפוי כי כמויות גדולות יחסית של MNPs הם הכלאה עם photocatalysts מוליכים למחצה.
דיווח הראשונים סינתזה באתרו של חלקיקי נחושת (CuNPs) 21 בתוך מרחב interlayer של LMOS (טיטניה nanosheet; TNS 16-30) סרטים שקופים באמצעות צעדים פשוטים מאוד. עם זאת, הפרטים של הנהלים הסינתטיים ואת האפיון של כלאי MNPs ו- TNS נעלות האחרים שטרם דווחו. יתר על כן, CuNPs בתוך שכבות TNS היה מתחמצן בקלות decolorized בתנאי סביבת 21. ככזה, התמקדנו חלקיקי זהב (AuNPs), כי AuNPs נמצא בשימוש נרחב עבור אופטי, פוטו שונה, ויישומים קטליטי, והוא צפוי שהם יהיו יחסית יציב מול חמצון 3-5,7,8,10-14 , 28,31,32. כאן אנו מדווחים את הסינתזה של AuNPs במרחב interlayer של TNS ולהראות that 2-ammoniumethanethiol (2-AET +; איור 1 הבלעה) עובד בצורה יעילה כמו מגיב מגן AuNPs בתוך interlayer של TNS.
Protocol
Representative Results
Discussion
כתב יד זה מספק פרוטוקול מפורט לסינתזה באתרו של חלקיקי זהב (AuNPs) בתוך מרחב interlayer של סרטי TNS. זהו הדו"ח הראשון של סינתזה באתרו של AuNPs במרחב interlayer של TNS. יתר על כן, מצאנו כי 2-AET + עובד כמו מגיב מגן יעיל AuNPs בתוך interlayer של TNS. שיטות אלה כלת AuNPs ו- TNS סרטים שקופים. TNS ?…
Offenlegungen
The authors have nothing to disclose.
Acknowledgements
This work was partly supported by Nippon Sheet Glass Foundation for Materials Science and Engineering and JSPS KAKENHI (Grant-in-Aid for Challenging Exploratory Research, #50362281).
Materials
| Methyl viologen dichloride | Aldrich Chemical Co., Inc. | 1910-42-5 | |
| Tetrabutylammonium hydroxide | TCI | T1685 | |
| cesium carbonate | Kanto Chemical Co., Inc. | 07184-33 | |
| anatase titanium dixoide | Ishihara Sangyo Ltd. | ST-01 | |
| hydrochloric acid | Junsei Chemical Co., Ltd. | 20010-0350 | |
| sodium hydroxide | Junsei Chemical Co., Ltd. | 195-13775 | |
| Tetrachloroauric(III) acid trihydrate | Kanto Chemical Co., Inc. | 17044-60 | |
| sodium tetrahydroborate | Junsei Chemical Co., Ltd. | 39245-1210 | |
| 2-ammoniumethanethiol hydrochloride | TCI | A0296 | |
| Ultrapure water (0.056 µS/cm) | Milli-Q water purification system (Direct-Q® 3UV, Millipore) | ||
| Microscope slide (Thickness : 1.0∼1.2 mm) | Matsunami glass Co., Ltd. | ||
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