Facile preparation of SERS-active nanogap-rich Au nanoleaves

Hwang, Yong Kyung; Hong, Jin; Kim, Hee Jin; Kim, Sung Jin; Won, Yong Sun; Huh, Seong

doi:10.1039/c1cc11539a

Cited by 16 publications

(19 citation statements)

References 23 publications

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“…Much smaller particles on the surfaces of conducting polymer particles were also observed, and distinctly different from the previously reported Au-based nanostructures obtained by using AuCl 4 À ion in the presence of various thiophene derivatives ( Fig. 1) [17][18][19][20]. Noteworthy to mention is that the types of thiophene derivatives but also the types of metallic precursors are important in forming different metallic nanostructures.…”

Section: Resultscontrasting

confidence: 47%

“…In this novel process, there is no need for extra reducing agent and surface capping organic ligands for the production of the sub-20 nm Pd-NPs. Besides the polythiophene conducting polymers, small molecules such as 2-thiophenecarboxaldehyde, 2,2 0 -bithiophene and other oligomers derived from 2-TPM have been known to be generated during the redox reaction [17]. The resulting Pd-NP/polythiophene nanospheres were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM).…”

Section: Resultsmentioning

confidence: 99%

“…2-TPM underwent oxidative polymerization during the redox reaction to form polythiophene polymers or oligomers. Meanwhile, nonfunctionalized thiophene (TP) could reduce the AuCl 4 À precursor to Au-NPs very uniformly distributed in the polythiophene polymers [17]. 2-Thiopheneacetic acid (2-TAA) effectively reduced AuCl 4 À ions and generated SERS-active spherical Au nanorosettes [18].…”

Section: Introductionmentioning

confidence: 99%

“…If the metallic precursors possess redox potentials high enough to oxidize the thiophene derivatives, neither extra reducing agent nor surface capping ligands is necessary for the preparation of metallic NPs. This phenomenon was used to exploit novel synthetic methods of Au nanostructures, such as nanogap-rich flat Au nanoleaves with a good surface-enhanced Raman scattering (SERS) activity simply prepared using AuCl 4 À ion and 2-thiophenemethanol in water at room temperature [17]. 2-TPM underwent oxidative polymerization during the redox reaction to form polythiophene polymers or oligomers.…”

Section: Introductionmentioning

confidence: 99%

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Simple preparation of Pd-NP/polythiophene nanospheres for heterogeneous catalysis

Bae

Kim

Hwang

et al. 2015

Journal of Colloid and Interface Science

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Section: Resultscontrasting

confidence: 47%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simple preparation of Pd-NP/polythiophene nanospheres for heterogeneous catalysis

Bae

Kim

Hwang

et al. 2015

Journal of Colloid and Interface Science

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“…Then the mixture was subjected to a mild shaking at 800 rpm for 4 h and uniform lamellar AgNLs were obtained after purification. Although some previous reported methods have produced analogous noble metal lamellar nanostructures or even Au leaves using thiol ligands, − they lacked control over the uniform morphology and highly ordered structures. Herein, this solution process of preparing uniform, lamellar structured AgNLs was convenient and simple, as well as highly reproducible.…”

mentioning

confidence: 99%

Spontaneous Self-Assembly of Silver Nanoparticles into Lamellar Structured Silver Nanoleaves

Wang

2013

ACS Nano

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Uniform lamellar silver nanoleaves (AgNLs) were spontaneously assembled from 4 nm silver nanoparticles (AgNPs) with p-aminothiophenol (PATP) as mediator under mild shaking at room temperature. The compositions of the AgNLs were verified to be ∼1 nm Ag25 nanoclusters and PATP molecules in quinonoid model. The underlying assembly mechanism was systematically investigated and a two-step reaction process was proposed. First, the 4 nm AgNPs were quickly etched to ∼1 nm Ag25 nanoclusters by PATP in the form of [Ag25(PATP)n]n+ (n<12), which were then further electrostatically or covalently interconnected by PATP to form the repeated unit cells of [Ag25(PATP)n-1](n-1)+-PATP-[Ag25(PATP)n-1](n-1)+ (abbreviated as Ag25-PATP-Ag25). Second, these Ag25-PATP-Ag25 complexes were employed as building blocks to construct lamellar AgNLs under the directions of the strong dipole-dipole interaction and the π-π stacking force between the neighboring benzene rings of PATP. Different reaction parameters including the types and concentrations of ligands, solvents, reaction temperature, ionic strength, and pH, etc., were carefully studied to confirm this mechanism. Finally, the preliminary investigations of the applications for AgNLs as "molecular junctions" and SERS properties were demonstrated. We expect that this convenient and simple method can be in principle extended to other systems, or even mixture system with different types of NPs, and will provide an important avenue for designing metamaterials and exploring their physicochemical properties.

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A General and High‐Yield Galvanic Displacement Approach to AuM (M=Au, Pd, and Pt) Core–Shell Nanostructures with Porous Shells and Enhanced Electrocatalytic Performances

Kuai

Geng

Wang

et al. 2012

Chemistry A European J

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In this work, we utilize the galvanic displacement synthesis and make it a general and efficient method for the preparation of Au-M (M = Au, Pd, and Pt) core-shell nanostructures with porous shells, which consist of multilayer nanoparticles. The method is generally applicable to the preparation of Au-Au, Au-Pd, and Au-Pt core-shell nanostructures with typical porous shells. Moreover, the Au-Au isomeric core-shell nanostructure is reported for the first time. The lower oxidation states of Au(I), Pd(II), and Pt(II) are supposed to contribute to the formation of porous core-shell nanostructures instead of yolk-shell nanostructures. The electrocatalytic ethanol oxidation and oxygen reduction reaction (ORR) performance of porous Au-Pd core-shell nanostructures are assessed as a typical example for the investigation of the advantages of the obtained core-shell nanostructures. As expected, the Au-Pd core-shell nanostructure indeed exhibits a significantly reduced overpotential (the peak potential is shifted in the positive direction by 44 mV and 32 mV), a much improved CO tolerance (I(f)/I(b) is 3.6 and 1.63 times higher), and an enhanced catalytic stability in comparison with Pd nanoparticles and Pt/C catalysts. Thus, porous Au-M (M = Au, Pd, and Pt) core-shell nanostructures may provide many opportunities in the fields of organic catalysis, direct alcohol fuel cells, surface-enhanced Raman scattering, and so forth.

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Facile preparation of SERS-active nanogap-rich Au nanoleaves

Cited by 16 publications

References 23 publications

Simple preparation of Pd-NP/polythiophene nanospheres for heterogeneous catalysis

Simple preparation of Pd-NP/polythiophene nanospheres for heterogeneous catalysis

Spontaneous Self-Assembly of Silver Nanoparticles into Lamellar Structured Silver Nanoleaves

A General and High‐Yield Galvanic Displacement Approach to AuM (M=Au, Pd, and Pt) Core–Shell Nanostructures with Porous Shells and Enhanced Electrocatalytic Performances

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