From 1D chain to 3D network: Tuning hybrid II-VI nanostructures and their optical properties

Xiaoying Huang, Jing Li, Yong Zhang, Angelo Mascarenhas

Research output: Contribution to journalArticle

184 Citations (Scopus)

Abstract

In an effort to make semiconductor nanomaterials with tunable properties, we have deliberately designed and synthesized a family of novel organic - inorganic hybrid nanocomposites based on II-VI semiconductors with structures ranging from one-dimensional (1-D) chain to two-dimensional layer (2-D) to three-dimensional (3-D) framework. All nanostructures exhibit strong quantum confinement effect (QCE), while possessing a perfectly periodic arrangement. The optical absorption experiments show that all compounds generate a very large blue shift in the absorption edge (1.0-2.0 eV) due to the strong QCE. More significantly, their band edge shift and optical properties can be tuned by changing the dimensionality of inorganic motifs as well as overall crystal structures. Raman studies reveal that not only do these structures have distinctly different vibrational signatures from those of the II-VI host semiconductors, but they also differ significantly from each other as a result of changes in dimensionality. The crystal structures of these nanocomposite materials have been characterized by single crystal and/or powder X-ray diffraction methods. [ZnTe(pda)] (1; pda = propanediamine) is composed of 1-D chains of [ZnTe] with pda chelating to Zn atoms. [ZnTe(N2H4)] (2; N2H4 = hydrazine) and [ZnTe(ma)] (3; ma = MeNH2 = methylamine) are two-dimensional (2-D) layered structures containing [ZnTe] slabs and terminal hydrazine (2) or methylamine (3) molecules. The crystal structures of [CdSe(en)0.5] (4; en = ethylenediamine) and [CdSe(pda)0.5] (5) are 3-D networks containing [CdSe] slabs bridged by bidentate organic diamine molecules. Crystal data for 1: Orthorhombic, space group Pbcm, a = 9.997(2), b = 6.997(1), c = 10.332(2) Å, Z = 4. For 2: Monoclinic, space group P21, a = 4.2222(6), b = 6.9057(9), c = 7.3031 (10) Å, β = 98.92(8)°, Z = 2. For 3: Orthorhombic, Pbca, a = 7.179(1), b = 6.946(1), c = 18.913(4) Å, Z = 8. For 4: Orthorhombic, Pbca, a = 7.0949(3), b = 6.795(3), c = 16.7212(8) Å, Z = 8. For 5: Orthorhombic, Cmc21, a = 20.6660(12), b = 6.8900(4), c = 6.7513(4) Å, Z = 8.

Original languageEnglish
Pages (from-to)7049-7055
Number of pages7
JournalJournal of the American Chemical Society
Volume125
Issue number23
DOIs
Publication statusPublished - Jun 11 2003

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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