Au@Pd core–shell nanocubes with finely-controlled sizes

Kim, Do Youb; Choi, Kyeong Woo; Zhong, Xiaolan; Li, Zhi Yuan; Im, Sang Hyuk; Park, O. Ok

doi:10.1039/c3ce40175h

Cited by 30 publications

(24 citation statements)

References 46 publications

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“…1a ) show a particular contrast, occurring either near the tips of the CdSe core or along its sides. This can be attributed to a local deformation of the crystal lattice near the CdSe/CdS interface (Ashby–Brown diffraction contrast 36 37 38 ), and already gives a first indication of significant strain in our NCs. To further evaluate the deformation, we calculated the strain fields of the HRTEM images ( Fig.…”

Section: Resultsmentioning

confidence: 66%

Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals

et al. 2015

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Strain in colloidal heteronanocrystals with non-centrosymmetric lattices presents a unique opportunity for controlling optoelectronic properties and adds a new degree of freedom to existing wavefunction engineering and doping paradigms. We synthesized wurtzite CdSe nanorods embedded in a thick CdS shell, hereby exploiting the large lattice mismatch between the two domains to generate a compressive strain of the CdSe core and a strong piezoelectric potential along its c-axis. Efficient charge separation results in an indirect ground-state transition with a lifetime of several microseconds, almost one order of magnitude longer than any other CdSe/CdS nanocrystal. Higher excited states recombine radiatively in the nanosecond time range, due to increasingly overlapping excited-state orbitals. k̇p calculations confirm the importance of the anisotropic shape and crystal structure in the buildup of the piezoelectric potential. Strain engineering thus presents an efficient approach to highly tunable single- and multiexciton interactions, driven by a dedicated core/shell nanocrystal design.

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Section: Resultsmentioning

confidence: 66%

Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals

et al. 2015

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“…Moreover, with the recent advancement in colloidal synthesis chemistry for preparing highquality anisotropic Au NPs (e.g. nanorods, nanocubes, nanocages, nanoprisms, nanoplates, and dendrimer-like shapes) [123][124][125][126] , optimizing the size and shape of Au NPs for specific enhanced SPR sensing of biomolecules are now possible to be studied and demonstrated.…”

Section: Guidelines For Designing Gold Nanoparticles-amplified Spr Se...mentioning

confidence: 99%

Nanomaterials enhanced surface plasmon resonance for biological and chemical sensing applications

Zeng

Baillargeat²,

et al. 2014

Chem. Soc. Rev.

1,081

563

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The main challenge for all electrical, mechanical and optical sensors is to detect low molecular weight (less than 400 Da) chemical and biological analytes under extremely dilute conditions. Surface plasmon resonance sensors are the most commonly used optical sensors due to their unique ability for real-time monitoring the molecular binding events. However, their sensitivities are insufficient to detect trace amounts of small molecular weight molecules such as cancer biomarkers, hormones, antibiotics, insecticides, and explosive materials which are respectively important for early-stage disease diagnosis, food quality control, environmental monitoring, and homeland security protection. With the rapid development of nanotechnology in the past few years, nanomaterials-enhanced surface plasmon resonance sensors have been developed and used as effective tools to sense hard-to-detect molecules within the concentration range between pmol and amol. In this review article, we reviewed and discussed the latest trend and challenges in engineering and applications of nanomaterials-enhanced surface plasmon resonance sensors (e.g., metallic nanoparticles, magnetic nanoparticles, carbon-based nanomaterials, latex nanoparticles and liposome nanoparticles) for detecting "hard-to-identify" biological and chemical analytes. Such information will be viable in terms of providing a useful platform for designing future ultrasensitive plasmonic nanosensors.

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“…The formation of Au‐Pd nanocrystals with systematic shape evolution was also demonstrated . Previously Park and co‐workers synthesized Au‐Pd cubes using spherical gold seeds as the cores . The Au‐Pd particle size can be tuned from 11 to 41 nm.…”

Section: Bimetallic Core–shell Nanocrystalsmentioning

confidence: 99%

Facet‐Dependent Optical Properties Revealed through Investigation of Polyhedral Au–Cu₂O and Bimetallic Core–Shell Nanocrystals

Huang

Rej

Chiu

2015

Small

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The ability to prepare Au–Cu2O core–shell nanocrystals with precise control over particle size and shape has led to the discovery of facet‐dependent optical properties in cuprous oxide crystals. The use of Au cores not only allows the successful formation of Au–Cu2O core–shell nanocrystals with tunable sizes, but also enables the observation of facet‐dependent optical properties in these crystals through the Au localized surface plasmon resonance (LSPR) absorption band. By tuning the Cu2O shell morphology from rhombic dodecahedral to octahedral and cubic structures, and thus the exposed facets, the Au LSPR band position can be widely tuned. Such facet‐dependent optical effects are not observed in bimetallic Au–Ag and Au–Pd core–shell nanocrystals with the same precisely tuned particle sizes and shapes. It is believed that similar facet‐dependent optical properties could be observed in other ionic solids and other metal–metal oxide systems. The unusually large degree of plasmonic band tuning covering from the visible to the near‐infrared region in this type of nanostructure should be quite useful for a range of plasmonic applications.

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Au@Pd core–shell nanocubes with finely-controlled sizes

Cited by 30 publications

References 46 publications

Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals

Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals

Nanomaterials enhanced surface plasmon resonance for biological and chemical sensing applications

Facet‐Dependent Optical Properties Revealed through Investigation of Polyhedral Au–Cu₂O and Bimetallic Core–Shell Nanocrystals

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Au@Pd core–shell nanocubes with finely-controlled sizes

Cited by 30 publications

References 46 publications

Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals

Band structure engineering via piezoelectric fields in strained anisotropic CdSe/CdS nanocrystals

Nanomaterials enhanced surface plasmon resonance for biological and chemical sensing applications

Facet‐Dependent Optical Properties Revealed through Investigation of Polyhedral Au–Cu2O and Bimetallic Core–Shell Nanocrystals

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Facet‐Dependent Optical Properties Revealed through Investigation of Polyhedral Au–Cu₂O and Bimetallic Core–Shell Nanocrystals