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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Single-walled carbon nanotubes (SWCNTs) are foundational nanomaterials with tunable properties.
  • Substitutional doping, particularly with boron, is a key strategy for modifying SWCNT characteristics for semiconductor applications.

Purpose of the Study:

  • To demonstrate a reliable method for synthesizing boron-doped SWCNTs with controlled diameters.
  • To investigate the influence of synthesis parameters on SWCNT properties using high-vacuum chemical vapor deposition (HV-CVD).

Main Methods:

  • Utilized high-vacuum chemical vapor deposition (HV-CVD) for SWCNT synthesis.
  • Employed a variety of single- and multi-metal catalysts with different supports.
  • Investigated the impact of feedstock composition and pressure on the growth process.

Main Results:

  • Achieved reliable and consistent growth of small-diameter boron-doped SWCNTs.
  • Demonstrated a narrow diameter distribution largely independent of catalyst composition across a 300 °C temperature window.
  • Identified feedstock and pressure as primary factors influencing diameter distribution, with minor influence from synthesis parameters.

Conclusions:

  • HV-CVD with low-vapor pressure boron-containing feedstocks is a versatile and robust method for producing SWCNTs with defined, narrow diameter distributions.
  • The developed method minimizes the need for post-processing, making it suitable for industrial semiconductor applications.