Bioconjugated Nanohybrids of Ag Nanoparticles and CdTe Nanowires With Photoluminescence Enhancement
J Lee, T Javed, T Skieni, Garnett W. Bryant, A O. Govorov, N A. Kotov
Hybrid assembly of inorganic nanomaterials via chemical and biological bonding has received widespread attention. Nanomaterials that can be conjugated with other nanomaterials by ligand-receptor, antigen-antibody reactions, polymer tethering, and DNA hybridization are important for fundamental studies of electronic and optical processes in the nano-scale regime, as well as for development of advanced sensing and imaging devices. Recently, we observed that the collective plasmon resonance in intentionally assembled Au nanoparticles (NPs) can change the PL intensity and exciton dynamics of CdTe NPs and nanowires (NWs). Here, we investigate new superstructures based on Ag NPs instead of Au NPs. Ag based superstructures also demonstrate remarkable optical effects i.e., the enhancement of NW PL, stemming from SERS-like collective interactions of NPs and NWs in the secured conjugated superstructures. Although the observed optical phenomena in Ag- and Au-conjugated superstructures look similar, the underlying mechanism of emission enhancement in the Ag-NP conjugated superstructures is qualitatively different from the case of Au-based superstructures that we observed previously. We suggest that the emission enhancement due to Ag NP shells comes from the increase of absorption because the excitation wavelength is close to the plasmon resonance in the Ag-shell while the enhancement factor due to Au NP shell originates from the wavelength of exciton emission from NWs.
, Javed, T.
, Skieni, T.
, Bryant, G.
, Govorov, A.
and Kotov, N.
Bioconjugated Nanohybrids of Ag Nanoparticles and CdTe Nanowires With Photoluminescence Enhancement, Advanced Materials
(Accessed March 1, 2024)