Bimetal-decorated resistive gas sensors: a review (Mar, 10.1039/D5TC00145E, 2025)

Abstract

The authors sincerely regret that in the published article, in eqn (3) the ‘‘+’’ symbol was omitted on the left side, and a previous version of Fig. 5 was inadvertently used; in addition, the final two paragraphs from section 3, ‘‘Bimetal-decorated resistive gas sensors’’, Tables 2 and 3, and the Author contributions section, were omitted from the final published article. These details correspond to the revised manuscript that was approved for publication during the peer review process. The correct form of eqn (3) is as follows: O2-(ads) + e- → 2O-(ads) (3)The correct version of Fig. 5 is as follows: (Figure presented) The omitted paragraphs, and Tables 2 and 3, should appear immediately before the heading ‘‘Conclusions and outlook’’, and should read as follows: Table 2 summarizes the gas sensing performance of various bimetal-decorated resistive gas sensors. Overall, bimetal-decorated gas sensors have been successfully used for the detection of various gases such as H2, NO2, C3H6O, H2S, CH4, and CO gases. The optimal sensing temperature varies between RT to 400 °C depending on gas type, type of sensing material and type of bimetallic system. Response and recovery times also mainly depend on the sensing temperature; however, they are often short. Bimetaldecorated gas sensors generally have good long-term stability and show good stability at least up to 30 days after fabrication. (Table presented) Finally, detection limits down to ppb levels have been reported for bimetal-decorated gas sensors, showing their potential for the development of highly sensitive and reliable gas sensors. Table 3 summarizes the selectivity and long-term stability of various bimetal-decorated gas sensors. The selectivity ratio of Au65Pd35 bimetallic decoration for the SnO2 gas sensor is 7.18, which is seven times higher than that of the pristine SnO2 sensor at 150 °C.58While the optimal sensing temperature of the pristine ZnO sensor was 150 °C with a selectivity ratio of 3.15, AuPd bimetallic decoration decreased the sensing temperature to 100 °C and simultaneously increased the selectivity ratio to 14.95.60For the pristine In2O3 sensor, which operated optimally at temperatures above 250 °C, AuPd bimetallic decoration reduced the sensing temperature to 175 °C, achieving a high selectivity ratio of 10.00.61In addition, while the selectivity ratio of the pristine ZnO sensor was 1.00, PtAu bimetallic decoration increased the selectivity ratio to 14.70 at 130 °C.75Similarly, for the pristine ZnO sensor with an optimal sensing temperature of 200 °C, AuPt bimetallic decoration reduced the sensing temperature to 175 °C, resulting in a high selectivity ratio of 10.00.77Additionally, for a pristine WO3 sensor with an optimal sensing temperature of 300 °C, PtNi3 bimetallic decoration lowered the sensing temperature to 220 °C, achieving a selectivity ratio of 10.32.80 In particular, for the NOS PdPt/SnO2 sensor, the selectivity ratio was 1.87, while NOS Pd2Pt/SnO2 led to a dramatic increase in the selectivity ratio to 929.53 at 25 °C, achieved through an optimal Pd : Pt atomic loading ratio. These results underscore the effectiveness of bimetallic catalysts in improving both the selectivity and operating temperature of resistive gas sensors, highlighting their potential for high-performance applications. The author contributions section should read as follows: Author contributions Ka Yoon Shin: conceptualization, writing – original draft; Yujin Kim: investigation, visualization; Ali Mirzaei: conceptualization, writing – original draft; Hyoun Woo Kim: supervision, validation; Sang Sub Kim: supervision, project administration, writing – review & editing. The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers.