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Home | Applications | Effect of Temperature on structure of 2-D arrays of Gold Nanoparticles on SMART Grids

Effect of Temperature on structure of 2-D arrays of Gold Nanoparticles on SMART Grids

Gold on DNA Scheme

In this application, NanoBasic Grids were used as a platform for monitoring morphological changes in 2-D arrays of functionalized Au NPs as a function of temperature. Au NPs are finding broad application in areas such as catalysis and optical devices. Understanding and controlling the particle size and distribution is critical to maximizing performance.

In this study, NanoBasic Grids were use to prepare and characterize the 2-D Au NP arrays using a series of processing and characterization steps that illustrate the durability and unique features made possible by SMART Grids.

XPS

Fig 2. XPS spectrum of NanoBasic Grid modified with HfO2 monolayer.

  • Aggressive cleaning using oxygen plasma and RCA SC1
  • Functionalization with HfOCl2 to form a monolayer of HfO2.
  • XPS of surface to determine coverage of Hf on grid.
  • Self-assembly of phosphonate-functionalized AuNPs on the HfO2 surface to promote the formation of strongly-bonded, dense 2D arrays.
  • TEM imaging of 2-D array of AuNPs.
  • Heat Treatment of 2D arrays to 600°C and 900°C.
  • TEM imaging of heat treated grids.
Heat Treatment

Fig. 3 TEM images of the 2-D Au NP arrays heated-treated at 600°C and 900°C under flowing nitrogen are shown next to a grid that was imaged as prepared. Particle size analysis of the nanoparticles using ImageJ yielded particle size distributions shown in the histograms below the TEM images. For the as-prepared samples, the average particle size was 1.3 +/- 0.4 nm. After heat treatment at 600°C for 15 minutes, the particle size increased to 3.4 +/- 0.8 nm. After heat treatment in air at 900°C, the particles had increased in size to 6.1 +/- 2 nm. The strong interfacial bond between the functionalized nanoparticles and the SMART Grid surface helps to control the aggregation that occurs during high temperature processing. NanoBasic Grids can be heat treat up to 1000°C in air and other gases.