title: Size-controllable synthesis and bandgap modulation of single-layered RF-sputtered bismuth nanoparticles.
abstract: We here report a simple and efficient method to grow single-layer bismuth nanoparticles (BiNPs) with various sizes on glass substrates. Optimal conditions were found to be 200°C and 0.12 W/cm(2) at a growth rate of 6 Å/s, with the deposition time around 40 s. Scanning electron microscope (SEM) images were used to calculate the particle size distribution statistics, and high-resolution X-ray diffraction (XRD) patterns were used to examine the chemical interactions between BiNPs and the substrates. By measuring the transmission spectra within the range of 300 to 1,000 nm, we found that the optical bandgap can be modulated from 0.45 to 2.63 eV by controlling the size of these BiNPs. These interesting discoveries offer an insight to explore the dynamic nature of nanoparticles.
authors.affiliation: Institute of Biomedical Engineering, National Taiwan University, Taipei 10617, Taiwan ; Department of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd, Da'an District, Taipei 10617, Taiwan.
authors.forename: Bin-Kun
authors.initials: BK
authors.lastname: Wu
authors.affiliation: Department of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd, Da'an District, Taipei 10617, Taiwan.
authors.forename: Ming-Yau
authors.initials: MY
authors.lastname: Chern
authors.affiliation: Department of Physics, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd, Da'an District, Taipei 10617, Taiwan.
authors.forename: Hsin-Yen
authors.initials: HY
authors.lastname: Lee
keywords: Bismuth; Nanoparticle; RF sputtering