On‐Chip Fluorescent Sensor for Chemical Vapor Detection

Abstract

Organic thin‐film fluorescent sensor is an efficient tool for detecting trace chemical vapor, such as illegal drugs, explosives, nerve agents, and other dangerous substances due to its high sensitivity and quick response. However, most of the current device structures rely on space optics, which makes it challenging to integrate with complementary metal oxide semiconductor (CMOS) technology, and hence difficult for achieving chip‐level implementation. On the other hand, silicon nitride waveguide‐based photonics have recently shown strong potential for developing commercial‐scale fully integrated on‐chip gas sensors. In this work, to the best of the knowledge, the first chemical vapor detector based on fluorescence sensing is reported by the evanescent field of the waveguide on integrated photonic platform. By the simultaneous excitation and collection with the same waveguide, a detection limit of 0.19 and 93.7 ppb for methamphetamine and aniline, respectively, is achieved. Thanks to the good compatibility with CMOS fabrication processes, this on‐chip optical sensor can achieve production scalability as well as ease of integration with wearable electronic devices to meet the demands of portable, rapid detection. The technical route presented in this work provides a promising solution for compact, low‐cost fluorescence‐based gas sensors.

In Situ Optical Detection of Amines at a Parts-per-Quadrillion Level by Severing the Through-Space Conjugated Supramolecular Domino

“…Here, amphetamine simulant is selected as an example because its wide spreading and the unauthorized possession and distribution of amphetamine often result in significant health risks. , As shown in Figures S20 and S21, we add amphetamine simulant solutions of a variety of concentrations to the domino (PTF1 + pPFPA) solution and carefully track the change of its emission spectrum. Plotting the I 455 / I 570 over the amphetamine simulant concentration gives rise to a LOD of 1.75 ppb, which is among the highest sensitivity reported so far. , Manifesting the unique advantage of supramolecular domino sensors.…”

Dielectric Waveguide-Based Sensors with Enhanced Evanescent Field: Unveiling the Dynamic Interaction with the Ambient Medium for Biosensing and Gas-Sensing Applications—A Review

“…The diverse applications of these sensors encompass fields such as biomedical research, environmental monitoring, and industrial processes. By exploiting the evanescent field, these photonic sensors provide a robust foundation for advancing sensing technologies, offering innovative solutions with broad implications for scientific research and practical applications [25][26][27][28][29]. This review systematically delves into the nuanced concept of the evanescent field ratio in Section 2, elucidating its critical role in the development of highly sensitive photonic devices.…”

Biosensors for Odor Detection: A Review

“…In order to extend the detection range, detect harmful gases, objectively evaluate the gas type and intensity, and realize automatic measurement, plenty of gas sensors have been developed. Gas sensors can be divided into different categories according to their transducers such as field-effect transistor (FET) [18][19][20], quartz crystal microbalance (QCM) [21,22], surface acoustic wave (SAW) [23,24], surface plasmon resonance (SPR) [25,26], light-addressable potentiometric sensor (LAPS) [27], microelectrode array (MEA) [28,29], and fluorescence [30,31]. The sensing materials, e.g., carbon nanotube, polymer, carbon black composite, conducting polymer, lipid, or ionic liquid are utilized for odorant measurements.…”