5 Covalent Assemblies of Metal Nanoparticles—Strategies …
149
Fig. 5.15 a Synthesis of C 66 (COOH) 12 -mediated covalent assembly of Ru NP; and b optimized
structure of the C 66 (COOH) 12 –Ru 13 –C 66 (COOH) 12 species by DFT. Reproduced with permission
from Ref. [41]. c Correlation model of Ru@C 60 . Reproduced with permission from Ref. [80]
coverage formed hot spots. The Ag aggregates obtained demonstrate a high SERS
activity, suggesting that such substrates could be used for SERS detection of analytes
at a single-molecule level.
In this single-step method, the effect of the multidentate rigid ligands on the size of
Au NP was also investigated with different length of aryl ethynyls dithiol molecules
(L n and L b2 , Fig. 5.11b) [74]. It was revealed that the size of the Au NP and the final
structure as NP or assemblies are synergistically regulated by ligand length, ratio of
ligand to metal, and ligand coordination mode on the NP surface.
Novel Strategies Producing NP Assemblies
Covalent organic frameworks (COF) are porous materials with well-defined 2- or
3-dimensional structures with organic molecule building blocks, which have been
used as supports for metal NP with rather evenly distribution [85–88]. Lu et al.
have produced Pt NP@COF hybrid material with well-dispersed average NP using
thioether-containing COF (Fig. 5.16) [89]. The strong anchoring groups inside the
149
Fig. 5.15 a Synthesis of C 66 (COOH) 12 -mediated covalent assembly of Ru NP; and b optimized
structure of the C 66 (COOH) 12 –Ru 13 –C 66 (COOH) 12 species by DFT. Reproduced with permission
from Ref. [41]. c Correlation model of Ru@C 60 . Reproduced with permission from Ref. [80]
coverage formed hot spots. The Ag aggregates obtained demonstrate a high SERS
activity, suggesting that such substrates could be used for SERS detection of analytes
at a single-molecule level.
In this single-step method, the effect of the multidentate rigid ligands on the size of
Au NP was also investigated with different length of aryl ethynyls dithiol molecules
(L n and L b2 , Fig. 5.11b) [74]. It was revealed that the size of the Au NP and the final
structure as NP or assemblies are synergistically regulated by ligand length, ratio of
ligand to metal, and ligand coordination mode on the NP surface.
Novel Strategies Producing NP Assemblies
Covalent organic frameworks (COF) are porous materials with well-defined 2- or
3-dimensional structures with organic molecule building blocks, which have been
used as supports for metal NP with rather evenly distribution [85–88]. Lu et al.
have produced Pt NP@COF hybrid material with well-dispersed average NP using
thioether-containing COF (Fig. 5.16) [89]. The strong anchoring groups inside the