Humidity sensors based on molecular rectifiers

Abstract

Ambient humidity plays a key role in the health and well-being of us and our surroundings, making it necessary to carefully monitor and control it. To achieve this goal, several...

Gaining insight into molecular tunnel junctions with a pocket calculator without I–V data fitting. Five-thirds protocol

“…This is the case even for molecular junctions exhibiting substantial current rectification. 57 To better understand why the lowest order approximations of eqn ( 9) are adequate for most practical purposes I present below the next-to-leading corrections (i.e., retaining the terms proportional to (dV p /V p 2 ) in the Taylor series)…”

Combinatorial Scanning Kelvin Probe and Density Functional Theory Studies on Selective n-Butanol Adsorption Properties of pH-Dependent Bi2WO6 Nanostructures

“…In 2023, Sullivan et al have used the KP technique for humidity sensing. 33 Recently, in our work we have studied the influence of different humidity levels on CPD and WF of the MnFe 2 O 4 -based humidity sensor. 25 In the present study, n-type BW nanostructures were hydrothermally synthesized at different pH levels (like 1, 3, 5, 7, and 9), and their gas adsorption properties toward various VOCs like acetone, benzene, n-butanol, and TEA were examined using SKP at ambient temperature.…”

The Stark Effect: A Tool for the Design of High-Performance Molecular Rectifiers

“…Molecular electronic devices use molecules as the basic building blocks and have the potential to revolutionize the way electronic circuits are designed and manufactured. Their properties can be tailored by modifying the chemical structure of molecules used, and hence, they are quickly expanding into novel functionalities, including optical photoswitches, synaptic-emulating memristors, chemical and biological sensors, − and wires with tunable conductivity, all of which offer nanoscale and cost-efficient functionality to complement conventional technologies. One of the simplest molecular devicesthe molecular rectifierconsists of a single molecule or a self-assembled monolayer (SAM) sandwiched between two contacts that acts as a conductor under forward bias and as an insulator under the opposite bias, allowing current to effectively flow only in one direction.…”

“…The efficiency in current rectification is quantified by the rectification ratio, R = |J(V + )/J(V − )|, defined as the ratio between current density J under forward bias (V + ) and the current density under the reverse bias of the same magnitude, J(V − ). This device was theoretically proposed in 1974 7 and first demonstrated experimentally in the early 1990s, 8−10 with substantial improvements in performance being achieved within the past decade; several groups have reported rectification ratios of 10 2 −10 3 , and values of >10 5 have also been demonstrated. 11−18 The rectification process has largely been explained by intramolecular donor−acceptor mechanisms (Aviram and Ratner ansatz) and asymmetric tunneling through one or more frontier molecular orbitals.…”