Katmanlı Titanate Şeffaf Filmleri Interlayers Uzayda Toplama olmadan Altın Nanopartiküller Yerinde Sentez
Summary
Burada, AuNPs agregasyonu olmadan katmanlı titanat filmlerin ara kat alanı içinde altın nano partiküller (AuNPs) yerinde sentezi için bir protokol mevcut. Hiçbir spektral değişiklik bile 4 ay sonra gözlenmiştir. sentezlenmiş malzemenin kataliz, foto-kataliz, ve düşük maliyetli plasmonik cihazların geliştirilmesinde uygulamaları beklenen yer alır.
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
Çeşitli soy metal nanopartiküller (MNPS) nedeniyle lokalize yüzey plazmon rezonansı (LSPR) özellikleri için karakteristik renkleri veya tonları sergilemesini; Bu şekilde, MNPS çeşitli optik ve / veya fotokimyasal uygulamalarda 1-4 kullanılabilir. Son zamanlarda, metal oksit yarı iletken, örneğin titanyum oksit (TiO 2) ve MNPS olarak (MOS) fotokatalizörlerin, kombinasyonları iyice fotokatalizörlerin 5-14 yeni tip olarak incelenmiştir. En MOS parçacıkları nispeten düşük bir yüzey alanına sahip Ancak, birçok durumda, MNPS çok küçük miktarlarda, MOS yüzeyinde bulunmaktadır. Diğer taraftan, tabakalı metal oksit yarı iletken (LMOSs) fotokatalitik özelliklerini sergiler ve geniş bir yüzey alanına, bir CMO 15-17 birim gramı başına tipik olarak birkaç yüz metre kare vardır. Buna ek olarak, çeşitli LMOSs interkelasyon özellikleri (yani, çeşitli kimyasal türler kendi genişletilebilir ve büyük tabaka yerleri içinde kalabilirler) 15-20 var. Bu nedenle, MNPS ve LMOSs bir kombinasyonu ile, MNPS nispeten büyük miktarlarda iletken fotokataliz ile hibridize olduğu tahmin edilmektedir.
(; TNS 16-30 titanyum nanosheet) şeffaf filmler çok basit adımlarda Biz bakır nanopartiküller (CuNPs) CMO ara katman alanı içinde 21 yerinde sentezinde ilk rapor etmiştir. Ancak, sentetik prosedürlerin ayrıntıları ve diğer soylu MNPS ve TNS melezleri karakterizasyonu henüz rapor edilmemiştir. Ayrıca, TNS tabakaları içinde CuNPs kolaylıkla okside ve çevre koşulları 21 altında renksiz hale bulundu. Bu nedenle, biz AuNPs çok çeşitli optik, fotokimyasal ve katalitik uygulamalar için kullanılır, çünkü altın nano partiküller (AuNPs) odaklanmış, ve onlar oksidasyon 3-5,7,8,10-14 karşı nispeten istikrarlı olacağı tahmin edilmektedir 28,31,32. Burada, TNS ve gösteri tha ara katman alanı içinde AuNPs sentezini raporT 2-ammoniumethanethiol (2-AET +; Şekil 1, ek) TNS ara katmanı içinde AuNPs için koruyucu bir reaktif olarak etkin bir şekilde çalışır.
Protocol
Representative Results
Discussion
Bu yazıda TNS filmlerin ara kat alanı içinde altın nano partiküller (AuNPs) yerinde sentezi için ayrıntılı bir protokolü sağlar. Bu TNS ara katman alanı içinde AuNPs yerinde sentezinin ilk rapordur. Ayrıca, 2-AET + TNS ara katmanı içinde AuNPs için tesirli bir koruyucu reaktif madde olarak görev bulundu. Bu yöntemler AuNPs ve TNS saydam filmler hibridize. Protokol bölümünde sunulan iyi bir optik şeffaflık 21 TNS filmler, sinterleme süreçleri (s-TNS filmle…
Divulgazioni
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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