Hydrothermal-assisted exfoliation of Y/Tb/Eu ternary layered rare-earth hydroxides into tens of micron-sized unilamellar nanosheets for highly oriented and color-tunable nano-phosphor films

详细信息    查看全文

• 作者：Qi Zhu ; Zhixin Xu ; Ji-Guang Li ; Xiaodong Li ; Yang Qi…
• 关键词：Layered rare ; earth hydroxide ; Ultra ; large unilamellar nanosheets ; Hydrothermal anion exchange ; Oriented films ; Color ; tunable emission
• 刊名：Nanoscale Research Letters
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：10
• 期：1
• 全文大小：3,175 KB
• 参考文献：1. Ogawa, M, Kuroda, K (1995) Photofunctions of intercalation compounds. Chem Rev 95: pp. 399-438 CrossRef
  2. Ida, S, Ogata, C, Eguchi, M, Youngblood, WJ, Mallouk, TE, Matsumoto, Y (2008) Photoluminescence of perovskite nanosheets prepared by exfoliation of layered oxides, K2Ln2Ti3O10, KLnNb2O7, and RbLnTa2O7 (Ln: lanthanide ion). J Am Chem Soc 130: pp. 7052-9 CrossRef
  3. Ida, S, Shiga, D, Koinuma, M, Matsumoto, Y (2008) Synthesis of hexagonal nickel hydroxide nanosheets by exfoliation of layered nickel hydroxide intercalated with dodecyl sulfate ions. J Am Chem Soc 130: pp. 14038-9 CrossRef
  4. Ida, S, Ogata, C, Shiga, D, Izawa, K, Ikeue, K, Matsumoto, Y (2008) Dynamic control of photoluminescence for self-assembled nanosheet films intercalated with lanthanide ions by using a photoelectrochemical reaction. Angew Chem Int Ed 47: pp. 2480-3 CrossRef
  5. Ida, S, Ogata, C, Matsumoto, Y (2009) pH dependence of the photoluminescence of Eu3+-intercalated layered titanium oxide. J Phys Chem C 113: pp. 1896-900 CrossRef
  6. Oh, E-J, Kim, TW, Lee, KM, Song, MS, Jee, AY, Lim, ST (2010) Unilamellar nanosheet of layered manganese cobalt nickel oxide and its heterolayered film with polycations. ACS Nano 8: pp. 4437-44 CrossRef
  7. Liu, ZP, Ma, R, Osada, M, Iyi, N, Ebina, Y, Takada, K (2006) Synthesis, anion exchange, and delamination of Co-Al layered double hydroxide: assembly of the exfoliated nanosheet/polyanion composite films and magneto-optical studies. J Am Chem Soc 128: pp. 4872-80 CrossRef
  8. Ma, RZ, Sasaki, T (2010) Nanosheets of oxides and hydroxides: ultimate 2D charge-bearing functional crystallites. Adv Mater 22: pp. 5082-104 CrossRef
  9. Liu, N, Luo, F, Wu, HX, Liu, YH, Zhang, C, Chen, J (2008) One-step ionic-liquid-assisted electrochemical synthesis of ionic-liquid-functionalized graphene sheets directly from graphite. Adv Funct Mater 18: pp. 1518-25 CrossRef
  10. Omomo, Y, Sasaki, T, Wang, LZ, Watanabe, M (2003) Redoxable nanosheet crystallites of MnO2 derived via delamination of a layered manganese oxide. J Am Chem Soc 125: pp. 3568-75 CrossRef
  11. Tanaka, H, Okumiya, T, Ueda, SK, Taketani, Y, Murakami, M (2009) Preparation of nanosheet by exfoliation of layered iron phenyl phosphate under ultrasonic irradiation. Mater Res Bull 44: pp. 328-33 CrossRef
  12. Izawa, K, Ida, S, Unal, U, Yamaguchi, T, Kang, JH, Choy, JH (2008) A new approach for the synthesis of layered niobium sulfide and restacking route of NbS2 nanosheet. J Solid State Chem 181: pp. 319-24 CrossRef
  13. Gándara, F, Perles, J, Snejko, N, Iglesias, M, Gómez-Lor, B, Gutiérrez-Puebla, E (2006) Layered rare-earth hydroxides: a class of pillary crystalline compounds for intercalation chemistry. Angew Chem Int Ed 45: pp. 7998-8001 CrossRef
  14. McIntyre, LJ, Jackson, LK, Fogg, AM (2008) Ln2(OH)5NO3?·?xH2O (Ln-?Y, Gd-Lu): a novel family of anion exchange intercalation hosts. Chem Mater 20: pp. 335-40 CrossRef
  15. Geng, FX, Ma, RZ, Sasaki, T (2010) Anion-exchangeable layered materials based on rare-earth phosphors: unique comination of rare-earth host and exchangeable anions. Acc Chem Res 43: pp. 1177-85 CrossRef
  16. McIntyre, LJ, Prior, TJ, Fogg, AM (2010)
• 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
• 出版者：Springer US
• ISSN：1556-276X

文摘

Efficient exfoliation of well-crystallized (Y0.96Tb x Eu0.04-x )2(OH)5NO3?·-em class="a-plus-plus">nH2O (0?≤-em class="a-plus-plus">x?≤-.04) layered rare-earth hydroxide (LRH) crystals into tens of micron-sized unilamellar nanosheets has been successfully achieved by inserting water insoluble oleate anions (C17H33COO?/sup>) into the interlayer of the LRH via hydrothermal anion exchange at 120°C, followed by delaminating in toluene. The intercalation of oleate anions led to extremely expanded interlayer distances (up to approximately 5.2?nm) of the LRH crystals and accordingly disordered stacking of the ab planes along the c-axis and also weakened interlayer interactions, without significantly damaging the ab plane. As a consequence, the thickness of the LRH crystals increased from approximately 1 to 10?μm, exhibiting a behavior similar to that observed from the smectite clay in water. Highly [111]-oriented and approximately 100-nm thick oxide films of (Y0.96Tb x Eu0.04-x ) 2O3 (0?≤-em class="a-plus-plus">x?≤-.04) have been obtained through spin-coating of the exfoliated colloidal nanosheets on quartz substrate, followed by annealing at 800°C. Upon UV excitation at 266?nm, the oxide transparent films exhibit bright luminescence, with the color-tunable emission from red to orange, yellow, and then green by increasing the Tb3+ content from x-- to 0.04.