Ultra-low detection limit chemoresistive NO₂ gas sensor using single transferred MoS₂ flake: an advanced nanofabrication

Abstract

In this work, a method of fabricating a NO2 nano-sensor working at room temperature with a low detectable concentration limit is proposed.

Advantages of Slow Sensing for Ambient Monitoring: A Practical Perspective

“…The rapid and reversible nature of these reactions demands meticulous scrutiny of the experimental setup to ensure the accuracy and reliability of the results. Indeed, Figure 4b illustrates another perplexing phenomenon: signal saturation leading to steady-state conditions in less than a second [45]. This rapid attainment of saturation raises intriguing questions about the underlying mechanisms governing ultrafast sensor responses.…”

“…Figure 4a illustrates this sensitivity by employing a piezoresistive nanomaterial [44], where even slight pressure alterations can result in sensor responses of a few milliseconds (ms). In this regard, Figure 4b reports an ultrafast gas sensor [45], claiming that injecting 100 ppb of NO 2 led to a response and recovery times of 50 and 75 milliseconds, respectively. Considering that exposure limits are set in hours, detecting NO 2 in milliseconds raises questions about the practicality and relevance of such rapid responses.…”

A Strategy for Multigas Identification Using Multielectrical Parameters Extracted from a Single Carbon-Based Field-Effect Transistor Sensor

“…Gas sensors, owing to their ability to accurately detect various gases, assume a critical role in diverse areas such as air quality monitoring, medical diagnosis, and industrial gas leakage prevention. − This multifaceted capability renders gas sensors indispensable, while simultaneously posing significant challenges within the realm of gas sensing technology. Currently, the predominant focus of gas sensor research lies in enhancing sensitivity and extending the limit of detection, among other aspects. − However, it is imperative to note that there is still room for improvement in terms of selectivity, especially in the detection toward multiple gases relying solely on a single gas sensor . For chemiresistive gas sensors, which have gained significant attention and application in recent years, − various approaches such as noble metal catalysis and surface modification have been extensively explored to enhance their selectivity. , These enhancement approaches for selectivity are advantageous solely for detecting a single target gas but have no benefit to the identification to various gases by a single gas sensor and even hinder the identification toward various gases, greatly limiting the application of the sensor.…”