Abstract
Raspberry-like structure, providing a high degree of symmetry and strong interparticle coupling, has received extensive attention from the community of functional material synthesis. Such structure constructed in the nanoscale using gold nanoparticles has broad applicability due to its tunable collective plasmon resonances, while the synthetic process with precise control of the morphology is critical in realizing its target functions. Here, we demonstrate a synthetic strategy of seed-mediated space-confined self-assembly using the virus-like silica (V-SiO2) nanoparticles as the templates, which can yield gold nanoraspberries (AuNRbs) with uniform size and controllable morphology. The spikes on V-SiO2 templates serve dual functions of providing more growth sites for gold nanoseeds and activating the space-confined effect for gold nanoparticles. AuNRbs with wide-range tunability of plasmon resonances from the visible to near infrared (NIR) region have been successfully synthesized, and how their geometric configurations affect their optical properties is thoroughly discussed. The close-packed AuNRbs have also demonstrated huge potential in Raman sensing due to their abundant “built-in” hotspots. This strategy offers a new route towards synthesizing high-quality AuNRbs with the capability of engineering the morphology to achieve target functions, which is highly desirable for a large number of applications.
Highlights
The raspberry, a typical fruit composed of aggregates of drupelets, has inspired the manufacture of a decent amount of micro- and nanomaterials
Such raspberry-inspired materials have been applied in a variety of fields including hydrophobic and hydrophilic coatings [1,2,3,4], micromotors [5], hierarchical templates [6,7], catalysis [8] and biomedicine [9,10]
The construction of metallic architectures, which can be achieved with raspberry-like structure as well, has become a research hotspot recently due to their superiority in providing high accessibility to catalytically active metal surfaces, which is of benefit for promising applications such as catalysis, energy storage and sensors [11,12,13,14,15]
Summary
The raspberry, a typical fruit composed of aggregates of drupelets, has inspired the manufacture of a decent amount of micro- and nanomaterials. Such raspberry-inspired materials have been applied in a variety of fields including hydrophobic and hydrophilic coatings [1,2,3,4], micromotors [5], hierarchical templates [6,7], catalysis [8] and biomedicine [9,10]. The precise control over the well-defined morphology and interparticle distance is critical [25,26], indicating that the fabrication process plays an essential role in maximizing the function of raspberry-like gold nanoparticles
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