Room temperature gas sensing properties of chemically exfoliated black phosphorus (BP) to oxidizing (NO2, CO2) and reducing (NH3,H2, CO) gases in a dry air carrier have been reported. To study the gas sensing properties of BP, chemically exfoliated BP flakes have been drop casted on Si3N4 substratesprovided with Pt comb-type interdigitated electrodes inN2 atmosphere. Scanning electron microscopy and x-ray photoelectron spectroscopy characterizations show respectively the occurrenceof a mixed structure, composed of BP coarse aggregates dispersed on BP exfoliated few layer flakesbridging the electrodes, and a clear 2p doubletbelongingto BP, which excludes the occurrence ofsurface oxidation. Room temperature electrical tests in dry air show a p-type response of multilayer BPwith measured detection limits of 20 ppb and 10 ppm toNO2 andNH3 respectively. No response toCOandCO2 has been detected, while a slight but steady sensitivity toH2 has been recorded. The reported results confirm, on an experimental basis, what was previously theoretically predicted, demonstrating the promising sensing properties of exfoliated BP.
Exfoliated black phosphorus gas sensing properties at room temperature
Ottaviano L;
2016
Abstract
Room temperature gas sensing properties of chemically exfoliated black phosphorus (BP) to oxidizing (NO2, CO2) and reducing (NH3,H2, CO) gases in a dry air carrier have been reported. To study the gas sensing properties of BP, chemically exfoliated BP flakes have been drop casted on Si3N4 substratesprovided with Pt comb-type interdigitated electrodes inN2 atmosphere. Scanning electron microscopy and x-ray photoelectron spectroscopy characterizations show respectively the occurrenceof a mixed structure, composed of BP coarse aggregates dispersed on BP exfoliated few layer flakesbridging the electrodes, and a clear 2p doubletbelongingto BP, which excludes the occurrence ofsurface oxidation. Room temperature electrical tests in dry air show a p-type response of multilayer BPwith measured detection limits of 20 ppb and 10 ppm toNO2 andNH3 respectively. No response toCOandCO2 has been detected, while a slight but steady sensitivity toH2 has been recorded. The reported results confirm, on an experimental basis, what was previously theoretically predicted, demonstrating the promising sensing properties of exfoliated BP.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.