Limits...
Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Herein, we present the formation of gold nanorods (GNRs) on novel gold–poly(methyl methacrylate) (Au–PMMA) nanocomposite substrates with unprecedented growth control through the polymer molecular weight (Mw) and gold-salt-to-polymer weight ratio. For the first time, GNRs have been produced by seed-mediated direct growth on surfaces that were pre-coated with polymer-immobilised gold seeds. A Au–PMMA nanocomposite formed by UV photoreduction has been used as the gold seed. The influence of polymer Mw and gold concentration on the formation of GNRs has been investigated and discussed. The polymer nanocomposite formed with a lower Mw PMMA and 20 wt % gold salt provides a suitable medium for growing well-dispersed GNRs. In this sample, the average dimension of produced GNRs is 200 nm in length with aspect ratios up to 10 and a distribution of GNRs to nanoparticles of nearly 22%. Suitable characterization techniques such as AFM and SEM have been used to support concept of the proposed growth method.

No MeSH data available.


(a,b) AFM topography and (c,d) phase images of 20 wt % Au–PMMA nanocomposites of samples with low Mw (P1-20) and high Mw (P2-20).
© Copyright Policy - Beilstein
Related In: Results  -  Collection

License 1 - License 2
getmorefigures.php?uid=PMC4979766&req=5

Figure 2: (a,b) AFM topography and (c,d) phase images of 20 wt % Au–PMMA nanocomposites of samples with low Mw (P1-20) and high Mw (P2-20).

Mentions: Hence, we have fabricated Au–PMMA nanocomposites using UV photoreduction for two different selected Mw of PMMA. The formation of gold nanoparticles in PMMA matrices with low and high Mw with 20 wt % gold salt is shown in Fig. 2. P1-20 denominates the Au–PMMA nanocomposite with low Mw and P2-20 is for the polymer with high Mw. Fig. 2 and Fig. 2 show AFM topographical images and Fig. 2 and Fig. 2 show AFM phase images of P1-20 and P2-20 nanocomposite samples. The images show that gold particles are distributed well at the surface of PMMA with mean particles size of 150 nm for P1-20 and 80 nm for P2-20 nanocomposites. Gwyddion, a multi-platform modular free software [37] for visualization and analysis of data from scanning probe microscopes has been used to process the AFM data and measure the particle size distribution in our samples. The AFM phase image in Fig. 2 and Fig. 2 are very helpful in identifying the bright spots in Fig. 2 and Fig. 2 and to establish whether they are big particles or not. The spots appear as the same colour as the surrounding polymer matrix, and formed Au nanoparticles can be observed on top of them. This means that there are few blisters formed on the polymer surface during UV irradiation.


Direct formation of gold nanorods on surfaces using polymer-immobilised gold seeds
(a,b) AFM topography and (c,d) phase images of 20 wt % Au–PMMA nanocomposites of samples with low Mw (P1-20) and high Mw (P2-20).
© Copyright Policy - Beilstein
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4979766&req=5

Figure 2: (a,b) AFM topography and (c,d) phase images of 20 wt % Au–PMMA nanocomposites of samples with low Mw (P1-20) and high Mw (P2-20).
Mentions: Hence, we have fabricated Au–PMMA nanocomposites using UV photoreduction for two different selected Mw of PMMA. The formation of gold nanoparticles in PMMA matrices with low and high Mw with 20 wt % gold salt is shown in Fig. 2. P1-20 denominates the Au–PMMA nanocomposite with low Mw and P2-20 is for the polymer with high Mw. Fig. 2 and Fig. 2 show AFM topographical images and Fig. 2 and Fig. 2 show AFM phase images of P1-20 and P2-20 nanocomposite samples. The images show that gold particles are distributed well at the surface of PMMA with mean particles size of 150 nm for P1-20 and 80 nm for P2-20 nanocomposites. Gwyddion, a multi-platform modular free software [37] for visualization and analysis of data from scanning probe microscopes has been used to process the AFM data and measure the particle size distribution in our samples. The AFM phase image in Fig. 2 and Fig. 2 are very helpful in identifying the bright spots in Fig. 2 and Fig. 2 and to establish whether they are big particles or not. The spots appear as the same colour as the surrounding polymer matrix, and formed Au nanoparticles can be observed on top of them. This means that there are few blisters formed on the polymer surface during UV irradiation.

View Article: PubMed Central - HTML - PubMed

ABSTRACT

Herein, we present the formation of gold nanorods (GNRs) on novel gold–poly(methyl methacrylate) (Au–PMMA) nanocomposite substrates with unprecedented growth control through the polymer molecular weight (Mw) and gold-salt-to-polymer weight ratio. For the first time, GNRs have been produced by seed-mediated direct growth on surfaces that were pre-coated with polymer-immobilised gold seeds. A Au–PMMA nanocomposite formed by UV photoreduction has been used as the gold seed. The influence of polymer Mw and gold concentration on the formation of GNRs has been investigated and discussed. The polymer nanocomposite formed with a lower Mw PMMA and 20 wt % gold salt provides a suitable medium for growing well-dispersed GNRs. In this sample, the average dimension of produced GNRs is 200 nm in length with aspect ratios up to 10 and a distribution of GNRs to nanoparticles of nearly 22%. Suitable characterization techniques such as AFM and SEM have been used to support concept of the proposed growth method.

No MeSH data available.