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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsResearchers reported that charged porphyrin molecular junctions could reach the conductance quantum, a result described in headlines as transporting charge “with no resistance.” The experiment did not demonstrate a bulk material, everyday wire or practical device with literal zero resistance: it measured electron transmission through individual, custom-made molecular ribbons connected to gold electrodes.
What the researchers measured
In a 2024 Journal of the American Chemical Society study, Jie-Ren Deng and colleagues tested edge-fused porphyrin nanoribbons in single-molecule junctions. The series contained up to eight nickel-porphyrin units; the longest members reached 7.1 nanometres. Trimethylsilyl alkynes at the ends served as proto-anchor groups for making contacts with gold electrodes. The team used scanning tunnelling microscope break-junction (STM-BJ) measurements to characterize conductance. The paper describes these specific molecular-junction experiments, not a ready-to-use wire.
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How conductance changed
Low-bias transport
With low-resistance gold-acetylide contacts, the ribbons reached low-bias conductance as high as 10−2 G0, where G0 is the conductance quantum. Electron transport at low bias remained suppressed compared with an ideal system.
Charged, high-conductance states
When bias induced charging in the junction, the molecules’ frontier orbitals realigned with the electrodes. In those high-conductance states, the reported conductance reached 1 G0, stated in the paper as 77.5 μS and corresponding to a current of 20 μA. These figures belong to the study’s experimental conditions; they are not specifications for a practical electrical wire.
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Conductance–voltage traces often showed peaks at zero bias. The researchers interpreted those peaks as evidence that a molecular energy level was resonant with the electrode Fermi level. The effect was most pronounced in longer ribbons, which had smaller HOMO–LUMO gaps.
What “no resistance” means here
Conductance reaching 1 G0 is a result about transmission through a molecular junction in a particular charged state. The headline phrase “no resistance” is shorthand for that result, not evidence of a bulk superconductor or a wire with zero resistance in ordinary use. The study does not establish a room-temperature device, a finished product or a material that can carry current without resistance outside the measured junction conditions. The authors’ paper describes the charging-driven orbital realignment and its effect on conductance.
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How this differs from porphyrin-fused graphene nanoribbons
A separate 2024 study, “Porphyrin-fused graphene nanoribbons” in Nature Chemistry, investigated a different material: a hybrid graphene nanoribbon made using solution-phase synthesis. It reported high local charge mobility measured with ultrafast optical-pump terahertz-probe spectroscopy, as well as prototype single-nanoribbon field-effect and single-electron transistor devices. Those mobility and transistor findings are not results of the STM-BJ porphyrin-junction study. The two works differ in structure, measurement and reported outcome.
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