A Capacitive Ice-Sensor Based on Graphene Nano-Platelets Strips.

This paper investigates the possibility of realizing ice sensors based on the electrical response of thin strips made from pressed graphene nano-platelets. The novelty of this work resides in the use of the same graphene strips that can act as heating elements via the Joule effect, thus opening the route for a combined device able to both detect and remove ice. A planar capacitive sensor is designed and fabricated, in which the graphene strip acts as one of the armatures.

Characterization of the thermal conductivity and diffusivity of graphene nanoplatelets strips: a low-cost technique.

This paper proposes a new technique to characterize the thermal conductivity and diffusivity of thin strips made by graphene nanoplatelets (GNP). The evaluation of these parameters is essential for a reliable design of thermal and electrothermal applications of graphene and is usually performed by means of assessed but expensive techniques such as those based on Raman effects and laser flash. The technique proposed here is simpler and less demanding in terms of equipment, and combines the results of an experimental characterization of the strip heated by the Joule effect obtained with infrared camera, with those provided by an electro-thermal model.

Electrical impedance sensing of organic pollutants with ultrathin graphitic membranes.

In this paper we propose an original approach for the real-time detection of industrial organic pollutants in water. It is based on the monitoring of the time evolution of the electrical impedance of low-cost graphitic nanomembranes. The developed approach exploits the high sensitivity of the impedance of 2D graphene-related materials to the adsorbents.

Temperature-dependent electrical resistivity of macroscopic graphene nanoplatelet strips.

This paper studies the temperature dependence of the electrical resistivity of low-cost commercial graphene-based strips, made from a mixture of epoxy and graphene nanoplatelets. An equivalent homogenous resistivity model is derived from the joint use of experimental data and simulation results obtained by means of a full three-dimensional (3D) numerical electrothermal model. Three different types of macroscopic strips (with surface dimensions of cm) are analyzed, differing in their percentage of graphene nanoplatelets.

A monitorable and renewable pollution filter based on graphene nanoplatelets.

This paper deals with the fabrication, modeling and experimental characterization of a monitorable and renewable graphene-based pollution filter. The main goal is to demonstrate a method to monitor the status of such a filter in real time during its operating phases: pollutant adsorption, saturation, and regeneration. The filter is realized by a disk of pressed graphene nanoplatelets.

Metal Dependence of the Highest Occupied Molecular Orbital in Sterically Hindered Octaethyltetraphenylporphyrins.

Resonance Raman (RR) spectra are reported for nickel(II) and copper(II) 2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphyrin (MOETPP) cation radicals in order to examine the influence of the substituent pattern and of out-of-plane distortions on the character of the porphyrin frontier orbitals. Isotopic frequency shifts ((13)C(m), (15)N, d(20)) were used to secure assignments of the RR bands. The highest occupied molecular orbital was found to switch from a(2u) to a(1u) between CuOETPP(+) and NiOETPP(+) as evidenced by (1) opposite shifts in the C(beta)C(beta) stretching mode, nu(2), and (2) selective enhancement of phenyl modes in CuOETPP(+) vs ethyl modes in NiOETPP(+).