Controlling Morphology-Structure of Gold Tiny Particles, Nanoparticles and Particles at Different Pulse Rates and Pulse Polarity

TL;DR

This paper investigates how varying pulse rates and polarity in a pulse-based process influence the morphology and structure of gold colloidal particles, revealing control over shape and aspect ratio for materials engineering.

Contribution

It introduces a novel pulse parameter tuning method to control gold nanoparticle shapes and structures during synthesis, expanding possibilities for tailored nanomaterials.

Findings

Triangular particles formed under bipolar pulses with specific OFF to ON ratios.

Unipolar pulses produce triangular particles directly.

Aspect ratio of particles varies with pulse OFF to ON ratio.

Abstract

Controlling the shape and structure of metallic colloids is an important topic. Here, different morphology-structures of colloidal gold particles are investigated with different process parameters in a pulse-based electron-photon and solution interface process. Different tiny-shaped particles of gold developed for different packets of supplied nano-energy as per set pulse OFF to ON time. Depending on the set ratios of pulse OFF to ON times and pulse polarity, packets of nano-energy bind transitional state gold atoms resting at electronically-flat solution surface that is controlled in their own shapes. Tiny particles of joined triangular shape in each case developed under set tuned ratio of bipolar pulses OFF to ON time. At unipolar pulse, tiny particles in triangular shape developed directly. When the ratio of bipolar pulse OFF to ON time was large, distorted shapes of the particles developed. Geometrical shapes of particles developed under significant ratios of pulse OFF to ON times. When the ratio of bipolar pulse OFF to ON time was 3, particles developed in low aspect ratio. But under the fraction of this ratio, particles tend to develop in high aspect ratio. For longer pulse ON time, structures of smooth elements get developed in width less than inter-spacing distance and forcing energy of travelling photons along the interface to flatten them further. Morphology and structure of tiny particles, nanoparticles and particles are discussed for different process parameters opening multiple routes for materials research and their counterparts. This is the overall attained orientation of electrons in elongated atoms forming colloidal particles of different size and shape maintaining the certain color of their solution under sunlight.