Over the past three decades, the rapid emergence of nanomaterials has fundamentally transformed the design and fabrication of biosensors. Today, at least one type of nanomaterial is an essential component of most nanobiosensors, providing enhanced robustness, improved analytical performance, and greater mechanical stability. These improvements are largely attributed to the intrinsic properties of nanomaterials, including high surface energies, exceptional surface-to-volume ratios, and their role as electroconducting pathways that accelerate electron transfer.
However, despite the advances, optimal biosensor performance is rarely achieved using conventional single-layer fabrication approaches. True breakthroughs often arise only when multilayered architectures are employed. The strategy of Layered Architectural Fabrication (LAF) provides a systematic means of assembling functional sensing layers sequentially, enabling precise control over selectivity, sensitivity, and stability.
In this talk, I will discuss a novel strategy for the design of more robust amperometric nanobiosensors based on a polypyrrole (PPy)-assisted LAF which enables the integration of nanomaterials, enzymes, metallic nanoparticles, and metallic nanowires into unified, high-performance biosensing platforms. Through diverse PPy-aided architectures, I will illustrate how the inherent advantages of nanomaterials—such as electron transfer facilitation, enhanced biocompatibility, and defect minimization—can be fully harnessed. I will further demonstrate how PPy-based composites generate tailored surface textures with increased active areas, while the incorporation of metallic nanoparticles enhances catalytic activity without compromising thermal stability or biocompatibility.
Successful fabrication of robust sulfite, phosphate, and cholesterol nanobiosensors will be discussed, as well as their validated performance in real sample analyses. Particular emphasis will be placed on how LAF effectively minimizes interference, a long-standing challenge in biosensor development. Finally, I will discuss the future potential of LAF in broadening the scope of nanobiosensor applications, offering a versatile platform for the development of next-generation devices capable of detecting a wide spectrum of inorganic and organic analytes with unprecedented reliability and efficiency.