Ultrasonic Spray Coating of Silver Nanowires

Ultrasonic Spray Coating of Silver Nanowires – Cheersonic

Silver nanowires are a novel high-end nanomaterial with a one-dimensional nanostructure. Their core dimensions are precisely controlled within a diameter of 100-150 nm and a length of 10-50 μm. They combine the excellent conductivity of silver with the unique structural advantages of nanomaterials, making them a core component in flexible electronics and transparent conductive applications. They appear as a silvery-white dispersion with a purity exceeding 99.9%. They possess a high aspect ratio, excellent flexibility (bending and folding without breakage), outstanding conductivity (transmittance of 85%-92%), and strong chemical stability. They can be prepared using hydrothermal methods, template methods, and chemical reduction methods. Compared to traditional silver nanoparticles, silver nanowires with a precise diameter of 100-150 nm are more likely to form continuous conductive networks, significantly improving transmittance and conductivity stability, thus meeting the performance requirements of high-end devices.

Although silver nanowires (100-150 nm in diameter) exhibit excellent performance, their high aspect ratio, high surface energy, and fine structural characteristics limit the achievement of high-quality film formation using traditional spray coating processes. Silver nanowires have an extremely high aspect ratio and large surface energy, making them prone to agglomeration and entanglement due to strong van der Waals forces. This leads to dense aggregates, resulting in defects such as porosity, uneven thickness, and surface roughness in the coating, hindering the establishment of a continuous conductive network and making it difficult to achieve both excellent conductivity and light transmittance. Furthermore, their thin and fragile nature makes them highly susceptible to breakage under the high pressure and mechanical shearing forces of traditional air-pressure spraying and spin coating processes. This significantly reduces conductivity, and the precise 100-150nm diameter structure is easily damaged, negating their core advantages. In addition, traditional processes suffer from uneven atomization, significant material loss, substantial waste of expensive silver nanowires, poor coating thickness consistency, numerous pinhole defects, and a tendency for nanowires to clog the spray gun. These issues prevent them from meeting the stringent coating standards of flexible electronics and touch displays, severely limiting their industrialization and large-scale application.

Chifei ultrasonic spraying machines, specifically designed for the material characteristics of 100-150nm silver nanowires, offer a customized precision spraying process that completely solves the various pain points of traditional processes. The equipment employs a 25kHz-180kHz high-frequency ultrasonic atomization principle. Through a piezoelectric transducer, electrical energy is converted into high-frequency mechanical vibration, uniformly atomizing the silver nanowire dispersion into micron-sized droplets. The entire process involves low-pressure, gentle atomization, without high-pressure impact or mechanical shearing, maximizing the protection of the intact nanowire structure and preventing breakage and oxidation, precisely preserving the core size advantage of 100-150nm. Simultaneously, high-frequency atomization effectively breaks up agglomerated and entangled nanowires, ensuring uniform distribution of nanowires within the sprayed droplets. This addresses the root causes of coating porosity and uneven thickness, fully releasing the core advantages of conductivity, light transmission, and flexibility.

Compared to traditional spraying processes, Chifei ultrasonic spraying equipment offers significant advantages. The equipment boasts high atomization uniformity, with coating thickness uniformity consistently within a 5% deviation. It enables the fabrication of nanoscale ultrathin continuous films, producing dense, pinhole-free, and crack-free coatings that effectively retain the high conductivity and high light transmittance of silver nanowires, meeting the performance requirements of high-end transparent electrodes and flexible devices. The non-contact directional deposition spraying method allows for silver nanowire utilization rates exceeding 90%, more than double that of traditional processes, significantly reducing production costs and aligning with green production principles. The equipment exhibits strong compatibility, adapting to various solvent systems for silver nanowire dispersions and various substrates including glass, flexible films, silicon wafers, and metals. It enables both large-area uniform spraying and small-area precision spraying, meeting the needs of both laboratory research and industrial mass production.

In practical applications, silver nanowire films prepared using the Chifei ultrasonic spraying machine exhibit stable performance and good repeatability, making them widely applicable across multiple fields. In the field of flexible electronics, it can be used as a conductive coating for flexible displays, flexible circuit boards, and wearable devices. Thanks to its excellent flexibility and conductivity, its conductivity remains undiminished even after thousands of bends. In the field of transparent electrodes, it can replace traditional ITO materials in touchscreens, OLED displays, and photovoltaic glass, balancing high light transmittance and high conductivity, making it suitable for high-end display and photovoltaic applications. In the field of touch displays, it can be used in touch panel fabrication to improve touch sensitivity and response speed. In the field of antibacterial protection, it can be used as a surface coating for medical devices and food packaging to achieve efficient antibacterial effects and ensure product safety.

Today, with the continuous iteration of flexible electronics, touch displays, and photovoltaic technologies, the market application of 100-150nm silver nanowires is becoming increasingly widespread, leading to ever-increasing demands for the precision and stability of spraying processes. Chifei Ultrasonic Equipment Co., Ltd. has been deeply involved in the field of nano-spraying for many years, focusing on solving the precision film formation challenges of various high-end nanomaterials. Relying on mature equipment technology and a complete process system, it provides efficient, stable, and cost-effective complete solutions for the preparation of 100-150nm silver nanowire thin films, helping various flexible electronics, display, and photovoltaic companies achieve technological upgrades and mass production.

About Cheersonic

Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.

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