Surfactant-assisted growth of uniform nanorods of crystalline tellurium

Liu, Zhaoping; Hu, Zhaokang; Quan, Xie; Yang, Baocheng; Wu, Ji; Qian, Yitai

doi:10.1039/b208420a

Cited by 99 publications

(77 citation statements)

References 30 publications

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“…[24] Although tellurium has a highly anisotropic crystal structure, which leads to inherent chirality and a tendency toward 1D growth, [25] so far hydrazine, surfactant, or other special precursors and additions are required for the synthesis of 1D tellurium nanostructures. [18,24±26] In this communication, we report for the first time a simple and mild biomolecule-assisted reduction method for the synthesis of single-crystalline tellurium nanowires under hydrothermal conditions.…”

Section: Methodsmentioning

confidence: 99%

Biomolecule‐Assisted Reduction in the Synthesis of Single‐Crystalline Tellurium Nanowires

Gao

Komarneni³

2004

Advanced Materials

131

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are both localized on the substituted side fluorene groups), a sizeable increase in electron affinity (by~0.91 eV) is achieved in poly-S-m-Br-methoxy in comparison to S-methoxy. Such donor±acceptor molecular systems might not be appropriate for blue-light emission: the triplet energy is indeed bounded upwards by that of the substituted units, which itself relates to the donor/acceptor strengths (hence only weak electroactive groups, translating into small changes in HOMO±LUMO energies, will ensure high singlet±triplet energy separations); however, they yield the smallest bandgap among all investigated hosts for green-light emission.To summarize, we have performed DFT calculations in order to design molecular hosts suitable for efficient colortunable triplet emission. Focusing on the carbazole and spiro building blocks, the influence of molecular topology on the triplet excited-state properties has been explored.The DFT results indicate the following:d host materials suitable for blue-light-emitting devices can be designed by interconnecting CBZ and spiro monomers through their meta (3,6) positions. In this case, the triplet wavefunction is mostly localized over 2 phenyl rings and the calculated S 0 ±T 1 energy gap amounts to~3 eV.d sequential interconnection in para (2,7) and meta positions causes the triplet to be more delocalized (typically over 3 phenyl rings), which considerably lowers the triplet energy. This route can be used to prepare hosts that are suitable for green-light-emitting devices.d interconnecting monomers in para positions leads to the triplet being delocalized over~4 phenyl rings and further lowers the singlet-triplet energy gap. Such compounds, which are characterized by the lowest ionization potentials and highest electron affinities, are the best candidates to be used as hosts in red-light-emitting devices. To further improve charge injection while maintaining a constant singlet±triplet gap, a series of oligomers substituted with electroactive groups on the side fluorene moieties of their spiro units have been investigated. This approach was found to be successful in the case of molecular architecture involving para connections between the spiro units, as in these molecules the triplet is confined to the main backbone while the HOMO and LUMO are localized on the side fluorenes. In contrast, the lowest triplet state of the oligomers with interconnections in meta positions is localized on the side segments, because in this case the energy gain caused by the substitution overwhelms that due to the interactions along the backbone. Therefore, the highest triplet energy that can be achieved in such configuration is bounded by the S 0 ±T 1 energy difference in the isolated substituted chromophore. For both para and meta inter-connected oligomers, the proposed strategy enables the dramatic improvement of hole and electron injection in hosts for green-and red-light emission. ExperimentalComputational Details: Density functional theory (DFT) [10] calculations were performed using the B3LYP hybrid f...

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Section: Methodsmentioning

confidence: 99%

Biomolecule‐Assisted Reduction in the Synthesis of Single‐Crystalline Tellurium Nanowires

Gao

Komarneni³

2004

Advanced Materials

131

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“…Recent progress has been made with the preparation of 1D nanostructures of Te. [26][27][28][29][30] Herein we demonstrate that the MAIL method is a fast, high-yield, seedless, template-free, and environmentally friendly green route for the production of Te nanorods and nanowires. This simple method does not need the subsequent complicated workup procedure required for the removal of the template or seed.…”

mentioning

confidence: 99%

Microwave‐Assisted Synthesis of Single‐Crystalline Tellurium Nanorods and Nanowires in Ionic Liquids

et al. 2004

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“…In its crystal structure, Te atoms are believed to be bound together through Van der Waals interactions in a hexagonal lattice which leads to preferential formation of 1D structures. 17 This unique property has been exploited by several groups to synthesize several 1D nanostructures like rods, 18,19 wires, 17,[20][21][22] tubes, [23][24][25][26] etc. These 1D Te nanostructures have further been utilised as a template for synthesizing different metal telluride nanostructures.…”

Section: Introductionmentioning

confidence: 99%