Consequently, their synthesis routes and subsequent device fabrication methods have an enormous impact on the economy and environment. Through the intelligent design of material synthesis and device fabrication, the cost of the products can be significantly reduced for economic sustainability, while at the same time being eco-friendly. Conventionally, these compounds are synthesized through a variety of routes such as the solvothermal process, arc melting, chemical vapor deposition, ball milling, and solid-state reaction. These processes often occur in multiple steps, consume large quantities of solvents and energy, and require highly controlled environments, such as vacuum or inert gases, at a specified temperature and pressure. Further, the assembly of the functional devices using these materials requires the homogeneous mixing of binders and conductive fillers with active materials to form a slurry, followed by the deposition on the substrate via a variety of coating or printing techniques. Unfortunately, the presence of binder and lack of close electrical contact between the active material, the conductive filler, and the electrode results in higher charge transfer resistance, which is not desirable in electrochemical devices. Besides, the durability of such devices is reduced owing to the delamination of the active material from the electrode. To address this, the active material is often directly synthesized on conductive substrates, such as metal foams, carbon cloth, fluorine-doped tin oxide glass, and carbon fiber paper (CFP), to produce binder-free [12,13] electrodes. However, since the conductive substrate is necessary to be inert, the choice of conductive substrates for various chemical systems is limited and all the chemical processes are not conducive to this approach. Also, for flexible/stretchable devices, [8,14,15] such as supercapacitors, batteries, and sensors, the deposition of active material on flexible/stretchable polymer substrates is a tedious task. For the aforementioned reasons, combining the synthesis of active materials and the device fabrication into a single step can facilitate the fabrication of various types of devices (e.g., flexible and stretchable) and at the same time contribute to a significant reduction in consumption resources such as solvents, chemicals, and energy. Laser-based synthesis can be a viable option to address the above problems. Laser-based Synthesis and coating of multi-metal oxides (MMOs) and alloys on conductive substrates are indispensable to electrochemical applications, yet demand multiple, resource-intensive, and time-consuming processes. Herein, an alternative approach to the synthesis and coating of alloys and MMOs by femtosecond laser direct writing (FsLDW) is reported. A solution-based precursor ink is deposited and dried on the substrate and illuminated by a femtosecond laser. During the illumination, dried precursor ink is transformed to MMO/ alloys and is simultaneously bonded to the substrate. The formulation of the alloy and MMO precursor ink for...