Tuning plasmonic nanostructures in graphene-based nano-sandwiches using ultraviolet/ozone functionalization
- PDF / 2,182,055 Bytes
- 14 Pages / 595.276 x 790.866 pts Page_size
- 34 Downloads / 144 Views
Tuning plasmonic nanostructures in graphene-based nano-sandwiches using ultraviolet/ozone functionalization Dai Zhang1, Ying Du1, Cheng Yang1, Pan Zeng1, Yan Yu1, Yujun Xie1, Rongqing Liang1, Qiongrong Ou1,*, and Shuyu Zhang1,* 1
Department of Light Sources and Illuminating Engineering, and Academy for Engineering and Technology, Institute for Electric Light Sources, Fudan University, Shanghai 200433, China
Received: 22 June 2020
ABSTRACT
Accepted: 19 September 2020
Graphene-based plasmonic sandwiches have received considerable research interest because of their intriguing optical, electronic and catalytic properties. The capability of tuning the distribution of plasmonic nanostructures is essential for exploring their intrinsic properties and potential applications. Herein, we report an ultraviolet (UV)/ozone-assisted approach to synthesizing gold nanoparticles/reduced graphene oxide/gold thin film (AuNPs/RGO/Au) plasmonic nano-sandwiches with easy and fine tunability of AuNPs at room temperature. The UV/ozone functionalization controls the activation of anchor sites for AuNPs on the GO scaffold without creating new defects on the basal plane. By simply varying the functionalization time, the loading density of AuNPs with an average size of * 17 nm is able to reach a value of over 500 lm-2, which is higher than previously reported values using other roomtemperature methods. The AuNPs/RGO/Au plasmonic nano-sandwiches offer remarkable near-field enhancement with an enhancement factor of over 300 in the Raman signal of graphene, which is comparable with the highest reported values. The as-prepared AuNPs/RGO/Au nano-sandwiches can be used as sensitive surface-enhanced Raman spectroscopy substrates. This work demonstrates that oxygen-containing functional groups, which were commonly considered to have negative effects on graphene-based nanocomposites, can contribute to the successful synthesis of high-loading plasmonic nanosandwiches.
Published online: 29 September 2020
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Handling Editor: Pedro Camargo.
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10853-020-05376-x
1360
J Mater Sci (2021) 56:1359–1372
GRAPHIC ABSTRACT
Introduction Functionalizing graphene with metal nanoparticles (NPs) has been demonstrated as an effective way to broaden its range of applications [1–7]. Among them, graphene-based plasmonic nano-sandwiches, which consist of two layers of metal components with a layer of graphene or its derivatives intercalated between them, have drawn tremendous research interest in the field including optoelectronics [8–10], energy conversion/storage [11, 12] and sensing [13–15]. In practical applications, it is of critical importance to have the capability of tuning the size and loading density of metal NPs [16] during the fabrication stage, since it determines the performance of plasmonic nano-sandwiches [1, 17]. So far, a variety of high-throughput synthetic strategies has been p
Data Loading...
