Paper-based analytical devices (PADs) and Electrospun Fiber-Based Biosensors (EFBs) have aroused the interest of the academy and industry due to their affordability, sensitivity, ease of use, robustness, being equipment-free, and deliverability to end-users. These features make them suitable to face the need for point-of-care (POC) diagnostics, monitoring, environmental, and quality food control applications. Our work introduces new and experienced researchers in the field to a practical guide for fibrous-based biosensors fabrication with insight into the chemical and physical interaction of fibrous materials with a wide variety of materials for functionalization and biofunctionalization purposes. This research also allows readers to compare classical and novel materials, fabrication techniques, immobilization methods, signal transduction, and readout. Moreover, the examined classical and alternative mathematical models provide a powerful tool for bioanalytical device designing for the multiple steps required in biosensing platforms. Finally, we aimed this research to comprise the current state of PADs and EFBs research and their future direction to offer the reader a full insight on this topic.

The bridge is a crucial component of the donor-bridge-acceptor (D-B-A) architecture when studying electron transport properties and molecular electronics. In this work, we explore the influence of the bridge on molecular rectification using the nonequilibrium Green’s function coupled with density functional theory. The systems considered here are phenylene-based structures with and without amino (−NH2) and nitro (−NO2) substituents at the D and A subunits, respectively. We define six different bridge structures with linearly conjugated, cross-conjugated, and saturated bonds. We calculate electron transport properties to obtain the current-voltage I–V characteristics and rectification ratios (R) at low bias voltages. Our results show that the I–V characteristics of the systems without substituents are symmetrical, suggesting a wire-like behavior. As expected, rectification is only present in the systems with substituents. The R is maximum in the D-XC-A system, with a value of 2.32 at 0.15 V, where XC is a cross-conjugated bridge. However, we conclude that the best rectification performance, with a R of 1.62, is that of the D-double-A system since the conductance is not compromised to promote rectification.

Photosensitive supramolecular systems have garnered attention due to their potential to catalyze highly specific tasks through structural changes triggered by a light stimulus. The tunability of their chemical structure and charge transfer properties provides opportunities for designing and developing smart materials for multidisciplinary applications. This review focuses on the approaches reported in the literature for tailoring properties of the photosensitive supramolecular systems, including MOFs, MOPs, and HOFs. We discuss relevant aspects regarding their chemical structure, action mechanisms, design principles, applications, and future perspectives.