Controlled Synthesis of Palladium Concave Nanocubes with Sub-10-Nanometer Edges and Corners for Tunable Plasmonic Property

Niu, Wenxin; Zhang, Weiqing; Shaik, Firdoz; Lu, Xianmao

doi:10.1021/cm500210u

Cited by 71 publications

(74 citation statements)

References 60 publications

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“…1,29−31 Pd concave cubes with sharply raised edges and corners have also been reported. 32 Further structural characterization of the Pd nanocrystals has been performed through XRD and TEM analysis. Figure 2 displays the XRD patterns of the medium-sized Pd nanocrystals with different shapes.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Direct Synthesis of Palladium Nanocrystals in Aqueous Solution with Systematic Shape Evolution

et al. 2015

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Palladium octahedra, truncated octahedra, cuboctahedra, truncated cubes, and nanocubes with sizes of tens of nanometers have been synthesized in an aqueous mixture of H2PdCl4 solution, cetyltrimethylammonium chloride (CTAC) surfactant, KBr solution, dilute KI solution, and ascorbic acid solution at 35 °C for 30 min. By tuning the amount of dilute KBr solution introduced, particle shape control can be achieved. Adjusting the volumes of the Pd precursor and KBr solutions added, smaller and larger Pd nanocrystals were obtained with excellent shape control. Extensive structural and optical characterization of these nanocrystals has been performed. Two absorption bands in the ultraviolet region can be discerned for these Pd nanocrystals. Concave Pd cubes can also be prepared. Pd cubes were found to grow at a faster rate than that for the formation of octahedra. The concentrations of KBr and KI in the solution are so low that spectral shifts were not detected upon their addition to the solution. The Pd nanocrystals can readily be used for various applications after simple removal of surfactant.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Direct Synthesis of Palladium Nanocrystals in Aqueous Solution with Systematic Shape Evolution

et al. 2015

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“…Pd NCs were synthesized by following a previously reported protocol with modifications [51]. Briefly, CTAB (182.24 mg) was dissolved in 5 mL of Millipore water and transferred to a 15 mL tube.…”

Section: Methodsmentioning

confidence: 99%

DNA-encoded morphological evolution of bimetallic Pd@Au core-shell nanoparticles from a high-indexed core

et al. 2018

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DNA-mediated synthesis of nanoparticles with different morphologies has proven to be a powerful method to synthesize and access many exclusive shapes and surface properties. While previous studies employ seeds that contain relatively low-energy facets, such as a simple cubic palladium seed in the synthesis of Pd-Au bimetallic nanoparticles, few studies have investigated whether DNA molecules can still exert their influence when the synthesis uses a seed that contains high-energy facets. Seeds that are enclosed by such high-energy facets or sites are known to act as easy nucleation sites in nanoparticles growth and could potentially suppress the effect of DNA. To answer this question, we herein report DNA-encoded control of morphological evolution of bimetallic Pd@Au core-shell nanoparticles from a concave palladium nanocube seed that contains high indexed facets. Based on detailed spectroscopic and SEM studies of time-dependent growth of the bimetallic nanoparticles, we found that each of 10-mer DNA molecules (T10, G10, C10 and A10) has a unique way of interacting with both the seed’s surface and the precursor. Among them, the most important factor is the binding affinity of the nucleobase to the Pd surface, with the A10 possessing the highest binding affinity and thus capable of stabilizing the seed’s high energy surfaces. Furthermore, for bases with lower binding affinity (T10, G10 and C10) than A10, the growth is completely dictated by the seed’s surface energy initially, but the later growth can still be influenced by the different DNA sequences, resulting in four unique morphologically different Pd@Au bimetallic nanoparticles. The effect of these DNA molecules with medium binding affinity can only be observed when there is more deposition of Au. Based on the above results, a scheme for the DNA controlled growth is proposed. Together these results have provided insights into factors governing DNA-mediated growth of core-shell structures using seeds with high-energy sites, and the insights can readily be applied to other bimetallic systems that adopt seed-mediated synthesis.

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“…One solution is to create an alloy form of Ag-Pd with a hollow structure for tuning the Figure 4 TEM images of the (a) palladium nanosheets, 37 (b) corolla-like Pd mesocrystals, 38 (c) 1D Pd superlattice nanowires, 39 (d) Pd concave nanocubes, 40 (e) silica-coated Pd nanosheets. 41 (f) TEM and EDX mapping images of the Pd@Ag nanoplates.…”

Section: Pd Nanoparticlesmentioning

confidence: 99%

“…36 Recently, Zheng and co-workers reported the synthesis of hexagonal Pd nanosheets (Figure 4a) 37 and Pd mesocrystals ( Figure 4b) 38 with strong NIR absorbance, which are promising photothermal therapeutic agents for tumors and cancer cells. Forming Pd superlattice nanowires via the electrostatic self-assembly of thin-layer Pd nanosheets (Figure 4c) 39 and fabricating Pd concave nanocubes (Figure 4d) 40 provided a new strategy for altering the SPR bands toward long wavelengths. Indeed, the Pd nanosheets could be further hybridized with other inorganic nanomaterials (for example, silica (Figure 4e) 41 and silver (Figure 4f)).…”

Section: Nir-absorbing/emitting Nanomaterials T-m Liu Et Almentioning

confidence: 99%

Revisiting the classification of NIR-absorbing/emitting nanomaterials for in vivo bioapplications

et al. 2016

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With the development of nonlinear optics and new imaging methods, near-infrared (NIR) light can excite contrast agents to probe biological specimens both functionally and structurally with a deeper imaging depth and a higher spatial resolution than linear optical approaches. There is considerable and growing interest in how biological specimens respond to NIR light. Moreover, the visible absorption band of most functional nanomaterials becomes NIR-excitable through multiphoton processes, thus allowing multifunctional imaging and combined therapy with noble metal and magnetic nanoparticles both in vitro and in vivo. A groundbreaking example is the use of different laser techniques to excite single-type NIR-absorbing/emitting nanomaterials to produce multiphoton emission by femtosecond lasers using either a remote control system for photodynamic therapy or photo-induced chemical bond dissociation. These techniques provided superior anatomical resolution and detection sensitivity for in vivo tumor-targeted imaging than those offered by conventional methods. Here we summarize the most recent progress in the development of smart NIR-absorbing/emitting nanomaterials for in vivo bioapplications.

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Controlled Synthesis of Palladium Concave Nanocubes with Sub-10-Nanometer Edges and Corners for Tunable Plasmonic Property

Cited by 71 publications

References 60 publications

Direct Synthesis of Palladium Nanocrystals in Aqueous Solution with Systematic Shape Evolution

Direct Synthesis of Palladium Nanocrystals in Aqueous Solution with Systematic Shape Evolution

DNA-encoded morphological evolution of bimetallic Pd@Au core-shell nanoparticles from a high-indexed core

Revisiting the classification of NIR-absorbing/emitting nanomaterials for in vivo bioapplications

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