Park Seon Ju, Lee Soo Min, Lee Jiwoo, Choi Sungkyun, Nam Gi Baek, Jo Yong Kun, Hwang In-Sung, Jang Ho Won
Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea.
Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea.
Small. 2025 Jan;21(2):e2405809. doi: 10.1002/smll.202405809. Epub 2024 Nov 7.
Demand for real-time detection of hydrogen and ammonia, clean energy carriers, in a sensitive and selective manner, is growing rapidly for energy, industrial, and medical applications. Nevertheless, their selective detection still remains a challenge and requires the utilization of diverse sensors, hampering the miniaturization of sensor modules. Herein, a practical approach via material design and facile temperature modulation for dual selectivity is proposed. A Pd nanoparticles-decorated WO nanowire gas sensor is prepared for dual detection of hydrogen and ammonia. The sensor exhibits distinct operating temperatures for ultraselective detection of hydrogen (125 °C) and ammonia (225 °C), with high responses of 35.3 and 133.8, respectively. This dual selectivity with high sensitivity is attributed to enhanced oxygen adsorption, the chemical affinity of sensing materials for target gases, and distinct reactivity profiles of gases. The proposed sensor is further integrated into a microelectromechanical system, enabling its small size, low power consumption, and rapid temperature modulation. Moreover, the practical feasibility of this sensor platform for smart energy monitoring systems is demonstrated by assessing its sensing properties in electrochemical ammonia oxidation reaction systems. This work can provide a practical approach for developing a single gas sensor with multiple functionalities for application in electronic nose systems.
对于能源、工业和医疗应用而言，以灵敏且具选择性的方式对清洁能源载体氢气和氨气进行实时检测的需求正迅速增长。然而，它们的选择性检测仍然是一项挑战，需要使用多种传感器，这阻碍了传感器模块的小型化。在此，提出了一种通过材料设计和简便的温度调制实现双重选择性的实用方法。制备了一种装饰有钯纳米颗粒的氧化钨纳米线气体传感器，用于氢气和氨气的双重检测。该传感器对氢气（125°C）和氨气（225°C）的超选择性检测表现出不同的工作温度，其响应率分别高达35.3和133.8。这种具有高灵敏度的双重选择性归因于增强的氧吸附、传感材料对目标气体的化学亲和力以及气体不同的反应特性。所提出的传感器进一步集成到微机电系统中，使其具有体积小、功耗低和温度调制快速的特点。此外，通过评估其在电化学氨氧化反应系统中的传感特性，证明了该传感器平台在智能能源监测系统中的实际可行性。这项工作可为开发用于电子鼻系统的具有多种功能的单一气体传感器提供一种实用方法。
