Pyroresistive response of percolating conductive polymer composites
Conductive polymer composites show a pyroresistive response useful for sensing applications, but the mechanism behind the positive temperature coefficient effect remains unclear. Simulations reveal that thermal expansion mismatch induces local strains that disconnect the percolating conductive network, causing a conductor–insulator transition and a sharp drop in conductivity.
E Barbieri, E Bilotti, Y Liu, C Grimaldi, Phys Rev Mater 8 045602 (2024)
Role of particle size polydispersity in the electrical conductivity in CNT-epoxy composites
Carbon nanotube (CNT)-polymer composites achieve electrical conductivity at low filler loadings, but the effects of CNT length polydispersity remain unclear. We shows that conductivity is primarily determined by the average CNT length due to the combined effects of polydispersity and clustering, providing a simple strategy for tuning electrical transport in CNT nanocomposites.
M Majidian, C Grimaldi, L Forro, A Magrez, Sci Rep 7 12553 (2017)
Solution of the tunneling-percolation problem in the nanocomposite regime
We extends tunneling-percolation theory to the intermediate transport regime in nanocomposites. Analysis of experimental data confirms electron tunneling as the dominant conduction mechanism and provides a framework for predicting and tailoring the electrical properties of composites with diverse filler geometries and distributions.
G Ambrosetti, C Grimaldi, I Balberg, T Maeder, A Danani, P Ryser, Phys Rev B 81 155434 (2010)
Nanocomposites papers
L Rossi, E Horváth, T Wang, C Grimaldi, A Sienkiewicz, BG Márkus, D Beke, L Forró, Tuning the color of high-karat gold in Au-TiO2 nanoparticle composites all the way to black, iScience 27 109655 (2024)
E Barbieri, E Bilotti, Y Liu, C Grimaldi, Pyroresistive response of percolating conductive polymer composites, Phys Rev Mater 8 045602 (2024)
AP Chatterjee, C Grimaldi, Geometric percolation of spherically symmetric Fractal Aggregates, J Stat Phys 188 29 (2022)
C Grimaldi, E Kecsenovity, M Majidian, VL Kuznetsov, A Magrez, L Forró, Electrical transport in onion-like carbon-PMMA nanocomposites, Appl Phys Lett 114 103102 (2019)
K Gnanasekaran, C Grimaldi, G de With, H Friedrich, A unified view on nanoscale packing, connectivity, and conductivity of CNT networks, Adv Funct Mater 29 1807901 (2019)
AP Chatterjee, C Grimaldi, Relation between a heterogeneous percolation model for cylinders and phase separation in the lattice fluid problem, Phys Rev E 98 062125 (2018)
M Majidian, C Grimaldi, L Forro, A Magrez, Role of the particle size polydispersity in the electrical conductivity of carbon nanotube-epoxy composites, Sci Rep 7 12553 (2017)
AP Chatterjee, C Grimaldi, A lattice model for the impact of volume fraction fluctuations upon percolation by cylinders, J Chem Phys 147 174902 (2017)
C Grimaldi, Tree-ansatz percolation of hard spheres, J Chem Phys 147 054702 (2017)
M Spina, C Grimaldi, B Náfrádi, L Forró, E Horváth, Rapid thickness reading of CH3NH3PbI3 nanowire thin films from color maps, Phys Status Solidi A 213 2017 (2018)
AP Chatterjee, C Grimaldi, Random geometric graph description of connectedness percolation in rod systems, Phys Rev E 92 (3), 032121 (2015)
C Grimaldi, Continuum percolation of polydisperse hyperspheres in infinite dimensions, Phys Rev E 92 012126 (2015)
AP Chatterjee, C Grimaldi, Tunneling conductivity in anisotropic nanofiber composites: a percolation-based model, J Phys Condens Matter 27 145302 (2015)
C Grimaldi, M Cattani, MC Salvadori, Dimensional effects on the tunneling conductivity of gold-implanted nanocomposite films, J Appl Phys 117 125302 (2015)
M Majidian, C Grimaldi, A Pisoni, L Forró, A Magrez, Electrical conduction of photo-patternable SU8-graphene composites, Carbon 80 364 (2014)
B Nigro, C Grimaldi, Impact of tunneling anisotropy on the conductivity of nanorod dispersions, Phys Rev B 90 094202 (2014)
C Grimaldi, Theory of percolation and tunneling regimes in nanogranular metal films, Phys Rev B 89 214201 (2014)
B Nigro, C Grimaldi, MA Miller, P Ryser, T Schilling, Depletion-interaction effects on the tunneling conductivity of nanorod suspensions, Phys Rev E 88 042140 (2013)
L Forró, R Gaal, C Grimaldi, M Mionić, PR Ribič, R Smajda, A Magrez, Tuning the length dispersion of multi-walled carbon nanotubes by ball milling, Aip Advances 3 092117 (2013)
C Grimaldi, M Mionić, R Gaal, L Forró, A Magrez, Electrical conductivity of multi-walled carbon nanotubes-SU8 epoxy composites, Appl Phys Lett 102 223114 (2013)
B Nigro, C Grimaldi, P Ryser, F Varrato, G Foffi, PJ Lu, Enhanced tunneling conductivity induced by gelation of attractive colloids, Phys Rev E 87 062312 (2013)
B Nigro, C Grimaldi, P Ryser, AP Chatterjee, P Van Der Schoot, Quasiuniversal connectedness percolation of polydisperse rod systems, Phys Rev Lett 110 015701 (2013)
B Nigro, C Grimaldi, MA Miller, P Ryser, T Schilling, Tunneling conductivity in composites of attractive colloids, J Chem Phys 136 164903 (2012)
B Nigro, C Grimaldi, P Ryser, Tunneling and percolation transport regimes in segregated composites, Phys Rev E 85 011137 (2012)
C Grimaldi, A complete graph effective medium approximation for lattice and continuum percolation, EPL 96 36004 (2011)
I Balberg, D Azulay, O Millo, G Ambrosetti, C Grimaldi, Comment on “Direct Measurement of the Percolation Probability in Carbon Nanofiber-Polyimide Nanocomposites”, Phys Rev Lett 106 079701 (2011)
B Nigro, G Ambrosetti, C Grimaldi, T Maeder, P Ryser, Transport properties of nonhomogeneous segregated composites, Phys Rev B 83 064203 (2011)
G Ambrosetti, I Balberg, C Grimaldi, Percolation-to-hopping crossover in conductor-insulator composites, Phys Rev B 82 134201 (2010)
G Ambrosetti, C Grimaldi, I Balberg, T Maeder, A Danani, P Ryser, Solution of the tunneling-percolation problem in the nanocomposite regime, Phys Rev B 81 155434 (2010)
G Ambrosetti, N Johner, C Grimaldi, T Maeder, P Ryser, A Danani, Electron tunneling in conductor-insulator composites with spherical fillers, J Appl Phys 106 016103 (2009)
N Johner, C Grimaldi, T Maeder, P Ryser, Optimal percolation of disordered segregated composites, Phys Rev E 79 020104(R) (2009)
G Ambrosetti, N Johner, C Grimaldi, A Danani, P Ryser, Percolative properties of hard oblate ellipsoids of revolution with a soft shell, Phys Rev E 78 061126 (2008)
N Johner, C Grimaldi, I Balberg, P Ryser, Transport exponent in a three-dimensional continuum tunneling-percolation model, Phys Rev B 77 174204 (2008)
N Johner, P Ryser, C Grimaldi, I Balberg, Piezoresistivity and tunneling-percolation transport in apparently nonuniversal systems, Phys Rev B 75 104204 (2007)
N Johner, C Grimaldi, P Ryser, Apparent nonuniversality in finite segregated tunneling–percolation models, Physica A 374 646 (2007)
C Grimaldi, I Balberg, Tunneling and nonuniversality in continuum percolation systems, Phys Rev Lett 96 066602 (2006)
S Vionnet-Menot, C Grimaldi, T Maeder, S Strässler, P Ryser, Tunneling-percolation origin of nonuniversality: Theory and experiments, Phys Rev B 71 (6), 064201 (2005)
S Vionnet-Menot, C Grimaldi, P Ryser, T Maeder, S Strässler, Strain modulation of transport criticality in RuO2-based thick-film resistors, Appl Phys Lett 85 5619 (2004)
C Grimaldi, T Maeder, P Ryser, S Strässler, A random resistor network model of voltage trimming, J Phys D: Appl Phys 37 2170 (2004)
S Vionnet, C Grimaldi, T Maeder, P Ryser, S Strässler, Strain dependence of transport critical exponent in RuO2‐glass systems, Ann Phys 516 99 (2004)
C Grimaldi, T Maeder, P Ryser, S Strässler, Segregated tunneling-percolation model for transport nonuniversality, Phys Rev B 68 024207 (2003)
C Grimaldi, T Maeder, P Ryser, S Strässler, Critical behaviour of the piezoresistive response in RuO2–glass composites, J Phys D: Appl Phys 36 1341 (2003)
C Grimaldi, T Maeder, P Ryser, S Strässler, Piezoresistivity and conductance anisotropy of tunneling-percolating systems, Phys Rev B 67 014205 (2003)
C Grimaldi, P Ryser, S Strässler, Anisotropic random resistor networks: A model for piezoresistive response of thick-film resistors, J Appl Phys 92 1981 (2002)
C Grimaldi, P Ryser, S Strässler, Longitudinal and transverse piezoresistive response of granular metals, Phys Rev B 64 064201 (2001)
C Grimaldi, P Ryser, S Strässler, Gauge factor enhancement driven by heterogeneity in thick-film resistors, J Appl Phys 90 322 (2001)
C Grimaldi, P Ryser, S Strässler, Gauge factor of thick-film resistors: Outcomes of the variable-range-hopping model, J Appl Phys 88 4164 (2000)