A method for growing large arrays of well-aligned carbon nanotubes on glass is reported. Carbon nanotubes with diameters from 20 to 400 nm and lengths from 0.1 to 50 micrometers were grown on nickel-coated glass at temperatures below 666°C using plasma-enhanced hot filament chemical vapor deposition. Acetylene gas was used as the carbon source, and ammonia gas as a catalyst and dilution gas. The nickel layer was deposited on the glass using radio frequency magnetron sputtering. The growth conditions were optimized to achieve uniform alignment and control over nanotube diameter. The nickel layer thickness was found to significantly influence nanotube diameter, with thinner layers producing smaller nanotubes. High-resolution transmission electron microscopy revealed that the nanotubes were hollow, multiwalled carbon nanotubes with structural defects. The growth mechanism was attributed to catalytic action of ammonia and nickel, rather than pore or etched track constraints. This method enables the fabrication of large panels of well-aligned carbon nanotubes suitable for applications such as cold-cathode flat panel displays. The study highlights the importance of controlled growth conditions for achieving uniform and aligned carbon nanotubes on glass.A method for growing large arrays of well-aligned carbon nanotubes on glass is reported. Carbon nanotubes with diameters from 20 to 400 nm and lengths from 0.1 to 50 micrometers were grown on nickel-coated glass at temperatures below 666°C using plasma-enhanced hot filament chemical vapor deposition. Acetylene gas was used as the carbon source, and ammonia gas as a catalyst and dilution gas. The nickel layer was deposited on the glass using radio frequency magnetron sputtering. The growth conditions were optimized to achieve uniform alignment and control over nanotube diameter. The nickel layer thickness was found to significantly influence nanotube diameter, with thinner layers producing smaller nanotubes. High-resolution transmission electron microscopy revealed that the nanotubes were hollow, multiwalled carbon nanotubes with structural defects. The growth mechanism was attributed to catalytic action of ammonia and nickel, rather than pore or etched track constraints. This method enables the fabrication of large panels of well-aligned carbon nanotubes suitable for applications such as cold-cathode flat panel displays. The study highlights the importance of controlled growth conditions for achieving uniform and aligned carbon nanotubes on glass.