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Polymorphic Assembly from Beveled Gold Triangular Nanoprisms.

Juyeong Kim, Xiaohui Song, Fei Ji1

  • 1Institute of Functional Nano and Soft Materials (FUNSOM), Collaborative Innovation Center for Suzhou Nano Science and Technology (NANO-CIC), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University , Suzhou, Jiangsu 215123, People's Republic of China.

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Summary
This summary is machine-generated.

Nanoscale details on gold triangular nanoprisms dictate self-assembly into unique honeycomb lattices. These structures enhance surface-enhanced Raman scattering signals for sensitive molecule detection.

Keywords:
Gold triangular nanoprismSERSdepletion attractiondirectional self-assemblymorphology detailsshape anisotropy

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Shape anisotropy in nanoparticles is crucial for assembly directionality.
  • Nanoscale morphological details significantly influence nanoparticle self-assembly but are often overlooked.

Purpose of the Study:

  • To investigate the impact of nanoscale beveling on gold triangular nanoprisms during self-assembly.
  • To explore the formation of novel self-assembled structures and their functional properties.

Main Methods:

  • Synthesis of shape-anisotropic gold triangular nanoprisms with specific nanoscale beveling.
  • Engineering electrostatic repulsion and depletion attraction to control self-assembly.
  • Characterization of assembled lattices using microscopy and surface-enhanced Raman scattering (SERS).

Main Results:

  • Formation of a planar honeycomb (p-honeycomb) lattice at low attraction.
  • Assembly of an interlocking honeycomb (i-honeycomb) lattice and supracrystals at high attraction due to nanoscale beveling.
  • The i-honeycomb lattice demonstrated a 5-fold increase in SERS signal and high sensitivity for Rhodamine 6G detection (10⁻⁸ M).

Conclusions:

  • Nanoscale geometrical features of anisotropic nanoparticles are critical for directing self-assembly into nonconventional ordered structures.
  • The engineered i-honeycomb lattice offers enhanced SERS performance for sensitive molecular detection.
  • This work provides a pathway for designing nanoparticle assemblies with tailored structures and functions.