Architectonic Quantum Dot Solids

Markovich, Gil; Collier, C. Patrick; Henrichs, Sven E.; Remacle, Françoise; Levine, R. D.; Heath, James R.

doi:10.1021/ar980039x

Cited by 357 publications

(326 citation statements)

References 37 publications

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“…For instance, Heath and coworkers measured the nonlinear optical properties of a Langmuir monolayer of alkanethiolate-protected silver nanoparticles and observed an insulator-metal transition when the interparticle spacing was reduced by mechanical compression. 3 This was interpreted by the distance dependence of electronic coupling between neighboring particle molecules. More recently, using an interdigitated array (IDA) electrode, we directly measured the electronic conductivity of alkanethiolate-protected gold nanoparticles at the air|water interface.…”

Section: Introductionmentioning

confidence: 99%

Electronic Conductivity of Semiconductor Nanoparticle Monolayers at the Air|Water Interface

Greene

Zhang

et al. 2003

J. Phys. Chem. B

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The electronic conductivity of PbS and CdTe nanoparticle monolayers was examined voltammetrically by using interdigitated array (IDA) electrodes at the air|water interface. Their band gap energies were estimated from the I-V responses and were very consistent with results obtained from optical measurements as well as solution electrochemistry. For CdTe nanoparticles, the I-V responses were analogous to those of a molecular diode with reproducible voltammetric behavior after repeated potential cycling. Interestingly, there appeared to be indications of particle surface trap states in the voltammetric responses that correlated with spectroscopic measurements. In addition, the band gap of the nanoparticle monolayers could be manipulated by the interparticle interactions, red shifting with decreasing interparticle separation. In contrast, the electroactive nature of the PbS particles led to the decomposition of the nanoparticles and hence deposition onto the electrode surface. The resulting voltammetric responses evolved from those typical of the faradaic reactions to a rectifying feature of much larger current scales, which finally became linear (ohmic) because of shorting between neighboring IDA fingers. In these studies, it was found that photoexcitation played an important role in regulating the current responses, providing a mechanistic basis on which to manipulate the electronic/electrical properties of semiconductor nanomaterials. The conductivity of the final interfinger deposits was about 2 orders of magnitude smaller than that for pure metallic lead, indicating some surface contamination and/or less than perfect crystalline structure.

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Section: Introductionmentioning

confidence: 99%

Electronic Conductivity of Semiconductor Nanoparticle Monolayers at the Air|Water Interface

Greene

Zhang

et al. 2003

J. Phys. Chem. B

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“…To apply nanocrystals as building blocks for practical electronic, magnetic, and optical devices, nanocrystals must be assembled. Although various nanocrystals have been assembled on flat substrates (11)(12)(13)(14)(15)(16)(17), the self-assembly of nanocrystals on cylindrical nanotube surfaces has also been reported recently (18)(19)(20)(21)(22)(23)(24)(25). When the coupling strength of overlapped wave functions between neighboring nanocrystals is tuned by compressing the lattice of nanocrystals, the range of tuning the electronic structures is considerable because the overlap depends exponentially on the interdot distance and the size (26,27).…”

mentioning

confidence: 99%

Cu nanocrystal growth on peptide nanotubes by biomineralization: Size control of Cu nanocrystals by tuning peptide conformation

Banerjee

Matsui

2003

Proc. Natl. Acad. Sci. U.S.A.

244

171

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With recent interest in seeking new biologically inspired devicefabrication methods in nanotechnology, a new biological approach was examined to fabricate Cu nanotubes by using sequenced histidine-rich peptide nanotubes as templates. The sequenced histidine-rich peptide molecules were assembled as nanotubes, and the biological recognition of the specific sequence toward Cu lead to efficient Cu coating on the nanotubes. Cu nanocrystals were uniformly coated on the histidine-incorporated nanotubes with high packing density. In addition, the diameter of Cu nanocrystal was controlled between 10 and 30 nm on the nanotube by controlling the conformation of histidine-rich peptide by means of pH changes. Those nanotubes showed significant change in electronic structure by varying the nanocrystal diameter; therefore, this system may be developed to a conductivity-tunable building block for microelectronics and biological sensors. This simple biomineralization method can be applied to fabricate various metallic and semiconductor nanotubes with peptides whose sequences are known to mineralize specific ions.

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“…Prashar et al (2010) have reported low-temperature synthesis of gadolinium monosulfide (GdS) nanoparticles and their pathogen capture efficiency. Nanosized materials have a larger surface area and the quantum mechanical effects such as 'quantum size effect' begins to play a significant role (Shi et al 2003;Zhang et al 2005;Kuang et al 2003;Kim et al 2004;Markovich et al 1999). Since properties of nanoparticles are highly dependent on their structure, size, and morphology, changes in concentration, temperature, and solvents are found to play a critical role in controlling the size-dependent properties.…”

Section: Introductionmentioning

confidence: 99%

Green hydrothermal synthesis and optical properties of γ-Gd2S3 nanoparticles

et al. 2015

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Green synthesis of c-Gd 2 S 3 nanoparticles was carried out using low-temperature hydrothermal route in autoclave. A 1:1 mixture of ionic liquid 1-ethyl-3-methylimidazolium ethyl sulfate, ([EMIM][EtSO4]), and water was used as a solvent. Synthesized nanoparticles were characterized by x-ray powder diffraction (XRPD), scanning electron microscopy (SEM), UV-visible spectroscopy (UV-vis), particle size by dynamic light scattering (DLS) technique, and photoluminescence (PL) studies. XRPD suggests cubic Th 3 P 4 -type structure for obtained Gd 2 S 3 nanoparticles. The size of synthesized nanoparticles is about 86 nm. Optical band gap for these nanoparticles estimated from electronic spectrum is 2.95 eV which shows blue shift from values reported for bulk Gd 2 S 3 due to pronounced quantum mechanical effect. These nanoparticles show sharp emission peak at 385 nm and a broad shoulder at 475 nm when excited at 260 nm.

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Architectonic Quantum Dot Solids

Cited by 357 publications

References 37 publications

Electronic Conductivity of Semiconductor Nanoparticle Monolayers at the Air|Water Interface

Electronic Conductivity of Semiconductor Nanoparticle Monolayers at the Air|Water Interface

Cu nanocrystal growth on peptide nanotubes by biomineralization: Size control of Cu nanocrystals by tuning peptide conformation

Green hydrothermal synthesis and optical properties of γ-Gd2S3 nanoparticles

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