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A New Strategy for Detecting Plant Hormone Ethylene Using Oxide Semiconductor Chemiresistors: Exceptional Gas Selectivity and Response Tailored by Nanoscale Cr2O3 Catalytic Overlayer
Advanced Science ( IF 14.3 ) Pub Date : 2020-02-24 , DOI: 10.1002/advs.201903093 Seong-Yong Jeong 1 , Young Kook Moon 1 , Tae-Hyung Kim 1 , Sei-Woong Park 1 , Ki Beom Kim 1 , Yun Chan Kang 1 , Jong-Heun Lee 1
Advanced Science ( IF 14.3 ) Pub Date : 2020-02-24 , DOI: 10.1002/advs.201903093 Seong-Yong Jeong 1 , Young Kook Moon 1 , Tae-Hyung Kim 1 , Sei-Woong Park 1 , Ki Beom Kim 1 , Yun Chan Kang 1 , Jong-Heun Lee 1
Affiliation
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A highly selective and sensitive detection of the plant hormone ethylene, particularly at low concentrations, is essential for controlling the growth, development, and senescence of plants, as well as for ripening of fruits. However, this remains challenging because of the non‐polarity and low reactivity of ethylene. Herein, a strategy for detecting ethylene at a sub‐ppm‐level is proposed by using oxide semiconductor chemiresistors with a nanoscale oxide catalytic overlayer. The SnO2 sensor coated with the nanoscale catalytic Cr2O3 overlayer exhibits rapid sensing kinetics, good stability, and an unprecedentedly high ethylene selectivity with exceptional gas response (Ra/Rg − 1, where Ra represents the resistance in air and Rg represents the resistance in gas) of 16.8 at an ethylene concentration of 2.5 ppm at 350 °C. The sensing mechanism underlying the ultraselective and highly sensitive ethylene detection in the unique bilayer sensor is systematically investigated with regard to the location, configuration, and thickness of the catalytic Cr2O3 overlayer. The mechanism involves the effective catalytic oxidation of interfering gases into less‐ or non‐reactive species, without limiting the analyte gas transport. The sensor exhibits a promising potential for achieving a precise quantitative assessment of the ripening of five different fruits.
中文翻译：
使用氧化物半导体化学电阻检测植物激素乙烯的新策略：由纳米级 Cr2O3 催化覆盖层定制的卓越气体选择性和响应
对植物激素乙烯（尤其是低浓度）进行高度选择性和灵敏的检测对于控制植物的生长、发育和衰老以及果实的成熟至关重要。然而，由于乙烯的非极性和低反应性，这仍然具有挑战性。在此，提出了一种通过使用具有纳米级氧化物催化覆盖层的氧化物半导体化学电阻来检测亚 ppm 级乙烯的策略。涂有纳米级催化Cr 2 O 3覆盖层的SnO 2传感器表现出快速传感动力学、良好的稳定性和前所未有的高乙烯选择性以及出色的气体响应（R a / R g − 1，其中R a代表空气中的电阻和R g表示在 350 °C、乙烯浓度为 2.5 ppm 的气体中的电阻为 16.8。针对催化 Cr 2 O 3覆盖层的位置、结构和厚度，系统地研究了独特双层传感器中超选择性和高灵敏度乙烯检测的传感机制。该机制涉及将干扰气体有效催化氧化成反应性较低或不活泼的物质，而不限制分析物气体的传输。该传感器在对五种不同水果的成熟度进行精确定量评估方面表现出巨大的潜力。
更新日期：2020-04-21
中文翻译：
使用氧化物半导体化学电阻检测植物激素乙烯的新策略：由纳米级 Cr2O3 催化覆盖层定制的卓越气体选择性和响应
对植物激素乙烯（尤其是低浓度）进行高度选择性和灵敏的检测对于控制植物的生长、发育和衰老以及果实的成熟至关重要。然而，由于乙烯的非极性和低反应性，这仍然具有挑战性。在此，提出了一种通过使用具有纳米级氧化物催化覆盖层的氧化物半导体化学电阻来检测亚 ppm 级乙烯的策略。涂有纳米级催化Cr 2 O 3覆盖层的SnO 2传感器表现出快速传感动力学、良好的稳定性和前所未有的高乙烯选择性以及出色的气体响应（R a / R g − 1，其中R a代表空气中的电阻和R g表示在 350 °C、乙烯浓度为 2.5 ppm 的气体中的电阻为 16.8。针对催化 Cr 2 O 3覆盖层的位置、结构和厚度，系统地研究了独特双层传感器中超选择性和高灵敏度乙烯检测的传感机制。该机制涉及将干扰气体有效催化氧化成反应性较低或不活泼的物质，而不限制分析物气体的传输。该传感器在对五种不同水果的成熟度进行精确定量评估方面表现出巨大的潜力。
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