Conductance Spectroscopy: A Novel Technique for Ultra-Selective Chemical Detection

IF 4.3 2区 综合性期刊 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Anuvindh R;Sukanya Mahalik;Amritendu Roy;Akshay K;Sayan Dey
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Abstract

The present work demonstrated a novel conduction spectroscopic technique for the detection of trace levels of chemicals at room temperature. The technique analyzes the second harmonic current variations of a surface-engineered resistance device. The device was fabricated by growing MoS2 nanosheets decorated with ordered nanoflakes on a Si/SiO2 substrate in a two-terminal device architecture. It was subjected to a dc voltage sweep, with varying concentrations of acetone (25%–100%), and its second harmonic spectra were analyzed against wavenumbers (k). The spectra revealed well-distinguished peaks at k values of ~800, ~1400, ~1700, and $\sim 2900~\text {cm}^{-{1}}$ corresponding to O-H bending, C-H bending, C=O stretching, and C-H stretching vibrational modes of the acetone molecule, respectively. The spectra can also be used to identify the nature of the bonds as oxidizing or reducing bonds, based on their effect on the carrier transport, from the direction of the peaks in the spectra. The technique showed unique spectra for NH4OH and 2-propanol, easily distinguishable from acetone. Furthermore, a comparative analysis of acetone peaks at varying concentrations demonstrated phase change to geminal-diol, giving a quantitative estimation of phase-change reactions. The device was highly repeatable, reproducible, and chemically stable for up to 60 days. Thus, the study proposed a novel chemical detection technique utilizing a resistive element to perform bond identification, reaction rates, phase-change studies, and semiconductor characterization with high accuracy. Hence, this technique may be generalized to compete with its optical counterparts by offering a portable system with ultrahigh detection efficiency toward unknown chemicals.
电导光谱:一种超选择性化学检测的新技术
本工作展示了一种在室温下检测痕量化学物质的新型传导光谱技术。该技术分析了表面工程电阻器件的二次谐波电流变化。该器件采用双端器件结构,在Si/SiO2衬底上生长以有序纳米片装饰的MoS2纳米片。用不同浓度的丙酮(25% ~ 100%)对其进行直流电压扫描,并根据波数(k)对其二次谐波谱进行分析。谱在k值为~800、~1400、~1700和$\sim 2900~\text {cm}^{-{1}}$处分别显示出丙酮分子的O- h弯曲、C- h弯曲、C=O拉伸和C- h拉伸振动模式。光谱还可以根据它们对载流子输运的影响,从光谱峰的方向来确定键的性质是氧化键还是还原键。该技术对NH4OH和2-丙醇具有独特的光谱,易于与丙酮区分。此外,对不同浓度的丙酮峰进行比较分析,证明了二元二醇的相变,给出了相变反应的定量估计。该装置具有高度可重复性、可重复性和长达60天的化学稳定性。因此,该研究提出了一种新的化学检测技术,利用电阻元件进行键识别、反应速率、相变研究和高精度的半导体表征。因此,该技术可以通过提供对未知化学物质具有超高检测效率的便携式系统来推广,以与光学同行竞争。
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来源期刊
IEEE Sensors Journal
IEEE Sensors Journal 工程技术-工程:电子与电气
CiteScore
7.70
自引率
14.00%
发文量
2058
审稿时长
5.2 months
期刊介绍: The fields of interest of the IEEE Sensors Journal are the theory, design , fabrication, manufacturing and applications of devices for sensing and transducing physical, chemical and biological phenomena, with emphasis on the electronics and physics aspect of sensors and integrated sensors-actuators. IEEE Sensors Journal deals with the following: -Sensor Phenomenology, Modelling, and Evaluation -Sensor Materials, Processing, and Fabrication -Chemical and Gas Sensors -Microfluidics and Biosensors -Optical Sensors -Physical Sensors: Temperature, Mechanical, Magnetic, and others -Acoustic and Ultrasonic Sensors -Sensor Packaging -Sensor Networks -Sensor Applications -Sensor Systems: Signals, Processing, and Interfaces -Actuators and Sensor Power Systems -Sensor Signal Processing for high precision and stability (amplification, filtering, linearization, modulation/demodulation) and under harsh conditions (EMC, radiation, humidity, temperature); energy consumption/harvesting -Sensor Data Processing (soft computing with sensor data, e.g., pattern recognition, machine learning, evolutionary computation; sensor data fusion, processing of wave e.g., electromagnetic and acoustic; and non-wave, e.g., chemical, gravity, particle, thermal, radiative and non-radiative sensor data, detection, estimation and classification based on sensor data) -Sensors in Industrial Practice
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