scholarly journals Recent Advances in Spectroscopic Gas Sensing With Micro/Nano-Structured Optical Fibers

2021 ◽  
Vol 11 (2) ◽  
pp. 141-157
Author(s):  
Wei Jin ◽  
Haihong Bao ◽  
Pengcheng Zhao ◽  
Yan Zhao ◽  
Yun Qi ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Gas Sensing ◽  
Gas Detection ◽  
Direct Absorption ◽  
Detection Systems ◽  
Recent Advances ◽  
Stimulated Raman

AbstractWith micro- and nano-structured optical fibers, parts-per-million to parts-per-trillion level gas detection has been demonstrated for a range of gases such as methane, acetylene, ethane, carbon monoxide, hydrogen, and oxygen. We review the recent development in optical fiber gas cells and gas detection systems based on direct absorption, photothermal, photoacoustic, and stimulated Raman spectroscopies.

scholarly journals Recent Advances in ZnO-Based Carbon Monoxide Sensors: Role of Doping

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4425
Author(s):  
Ana María Pineda-Reyes ◽  
María R. Herrera-Rivera ◽  
Hugo Rojas-Chávez ◽  
Heriberto Cruz-Martínez ◽  
Dora I. Medina
Keyword(s):  
Carbon Monoxide ◽  
High Performance ◽  
Gas Sensing ◽  
Experimental Studies ◽  
Electrical Performance ◽  
Long Term Stability ◽  
Sensing Applications ◽  
Recent Advances ◽  
Sensitivity And Selectivity ◽  
Doped Zno

Monitoring and detecting carbon monoxide (CO) are critical because this gas is toxic and harmful to the ecosystem. In this respect, designing high-performance gas sensors for CO detection is necessary. Zinc oxide-based materials are promising for use as CO sensors, owing to their good sensing response, electrical performance, cost-effectiveness, long-term stability, low power consumption, ease of manufacturing, chemical stability, and non-toxicity. Nevertheless, further progress in gas sensing requires improving the selectivity and sensitivity, and lowering the operating temperature. Recently, different strategies have been implemented to improve the sensitivity and selectivity of ZnO to CO, highlighting the doping of ZnO. Many studies concluded that doped ZnO demonstrates better sensing properties than those of undoped ZnO in detecting CO. Therefore, in this review, we analyze and discuss, in detail, the recent advances in doped ZnO for CO sensing applications. First, experimental studies on ZnO doped with transition metals, boron group elements, and alkaline earth metals as CO sensors are comprehensively reviewed. We then focused on analyzing theoretical and combined experimental–theoretical studies. Finally, we present the conclusions and some perspectives for future investigations in the context of advancements in CO sensing using doped ZnO, which include room-temperature gas sensing.

scholarly journals Selective gas detection using Mn3O4/WO3 composites as a sensing layer

2019 ◽  
Vol 10 ◽  
pp. 1423-1433 ◽  
Author(s):  
Yongjiao Sun ◽  
Zhichao Yu ◽  
Wenda Wang ◽  
Pengwei Li ◽  
Gang Li ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Hydrogen Sulfide ◽  
Gas Sensing ◽  
Gas Detection ◽  
Facile Hydrothermal Method ◽  
Potential Applications ◽  
Different Temperatures ◽  
Different Gases ◽  
Sensing Performance ◽  
Mn Concentrations

Pure WO3 sensors and Mn3O4/WO3 composite sensors with different Mn concentrations (1 atom %, 3 atom % and 5 atom %) were successfully prepared through a facile hydrothermal method. As gas sensing materials, their sensing performance at different temperatures was systematically investigated for gas detection. The devices displayed different sensing responses toward different gases at specific temperatures. The gas sensing performance of Mn3O4/WO3 composites (especially at 3 atom % Mn) were far improved compared to sensors based on pure WO3, where the improvement is related to the heterojunction formed between the two metal oxides. The sensor based on the Mn3O4/WO3 composite with 3 atom % Mn showed a high selective response to hydrogen sulfide (H2S), ammonia (NH3) and carbon monoxide (CO) at working temperatures of 90 °C, 150 °C and 210 °C, respectively. The demonstrated superior selectivity opens the door for potential applications in gas recognition and detection.

Impedance Spectroscopic Inspection Toward Sensitivity Enhancement of Ag-Doped WO3 Nanofiber-Based Carbon Monoxide Gas Sensor

2016 ◽  
Vol 872 ◽  
pp. 230-234
Author(s):  
Pundaree Boonma ◽  
Papot Jaroenapibal ◽  
Mati Horprathum ◽  
Sathiraporn Pornnimitra ◽  
Boonying Charoen ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Gas Sensing ◽  
Impedance Analysis ◽  
Nyquist Plot ◽  
Gas Detection ◽  
Ag Nanoparticle ◽  
Electrical Parameters ◽  
Electrospinning Technique ◽  
Sensor Material ◽  
Impedance Modeling

This work reports the impedance analysis and carbon monoxide gas sensing response of tungsten oxide (WO3) nanofibers with silver (Ag) nanoparticle doping. The Ag-doped WO3 nanofibers were prepared by an electrospinning technique. The impedance spectroscopic measurements of undoped and Ag-doped WO3 nanofibers were performed to study the contribution of electrical parameters involved in the electron transport. The impedance modeling obtained from the fitted Nyquist plot shows that the RC components attributed to Ag-WO3 interface are introduced to the system upon Ag addition. Carbon monoxide (CO) gas detection was carried out by resistance measurement using a DC method. The sensitivity of Ag-doped WO3 nanofibers is found to be greater than that of the undoped sample. The improved sensitivity is derived from the high interface resistance between Ag and WO3 grains. The contribution of Ag dopants is conceived to induce electronic structure alteration of the sensor material.

scholarly journals Laser-Based Trace Gas Detection inside Hollow-Core Fibers: A Review

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 3983
Author(s):  
Michal Nikodem
Keyword(s):  
Optical Fibers ◽  
Gas Sensing ◽  
Photonic Band Gap ◽  
Gas Detection ◽  
Trace Gas ◽  
Hollow Core ◽  
Trace Gas Detection ◽  
Optical Wave ◽  
Sensing Systems ◽  
Photonic Band

Thanks to the guidance of an optical wave in air, hollow-core fibers may serve as sampling cells in an optical spectroscopic system. This paper reviews applications of hollow-core optical fibers to laser-based gas sensing. Three types of hollow-core fibers are discussed: Hollow capillary waveguides, photonic band-gap fibers, and negative curvature fibers. Their advantages and drawbacks when used for laser-based trace gas detection are analyzed. Various examples of experimental sensing systems demonstrated in the literature over the past 20 years are discussed.

scholarly journals 3D Printing Technology for Tapered Optical Fiber Protection With Gas Sensing Possibilities

2020 ◽  
Vol 10 (4) ◽  
pp. 298-305
Author(s):  
Kaleb Roncatti de Souza ◽  
Jonas H. Osório ◽  
Juliana B. Carvalho ◽  
Beatriz Mota Lima ◽  
Cristiano M. B. Cordeiro
Keyword(s):  
3D Printing ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Gas Flow ◽  
Gas Sensing ◽  
Single Mode ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Fiber Taper ◽  
Tapered Optical Fiber

Abstract We present a new procedure for protecting micro-optical fibers (tapered fibers) by using the 3-dimension (3D) printing technology. A standard single-mode optical fiber was tapered down to the diameter of 1 µm and embedded in a polymeric matrix obtained by an additive manufacturing routine. We show that the proposed structure protects the fiber taper against environmental humidity while keeping permeability to gas flow and the possibility of the realization of gas detection experiments. To our knowledge, this is the first time 3D printed casings were applied to protect fiber tapers from humidity deterioration. We envisage this new approach will allow the development of new fiber taper devices to better resist in humid environments.

scholarly journals Immunosensing Based on Optical Fiber Technology: Recent Advances

Biosensors ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 305
Author(s):  
Maria Simone Soares ◽  
Miguel Vidal ◽  
Nuno F. Santos ◽  
Florinda M. Costa ◽  
Carlos Marques ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Practical Application ◽  
Fiber Gratings ◽  
Recent Advances ◽  
Fiber Technology ◽  
Manufacturing Complexity ◽  
Overall Performance ◽  
Complexity Cost ◽  
Future Direction

The evolution of optical fiber technology has revolutionized a variety of fields, from optical transmission to environmental monitoring and biomedicine, given their unique properties and versatility. For biosensing purposes, the light guided in the fiber core is exposed to the surrounding media where the analytes of interest are detected by different techniques, according to the optical fiber configuration and biofunctionalization strategy employed. These configurations differ in manufacturing complexity, cost and overall performance. The biofunctionalization strategies can be carried out directly on bare fibers or on coated fibers. The former relies on interactions between the evanescent wave (EW) of the fiber and the analyte of interest, whereas the latter can comprise plasmonic methods such as surface plasmon resonance (SPR) and localized SPR (LSPR), both originating from the interaction between light and metal surface electrons. This review presents the basics of optical fiber immunosensors for a broad audience as well as the more recent research trends on the topic. Several optical fiber configurations used for biosensing applications are highlighted, namely uncladded, U-shape, D-shape, tapered, end-face reflected, fiber gratings and special optical fibers, alongside practical application examples. Furthermore, EW, SPR, LSPR and biofunctionalization strategies, as well as the most recent advances and applications of immunosensors, are also covered. Finally, the main challenges and an outlook over the future direction of the field is presented.

Heating and Burning of Optical Fibers and Cables by Light Scattered from Bubble Train Formed by Optical Fiber Fuse

2012 ◽  
Vol E95.B (8) ◽  
pp. 2638-2641 ◽  
Author(s):  
Makoto YAMADA ◽  
Akisumi TOMOE ◽  
Takahiro KINOSHITA ◽  
Osanori KOYAMA ◽  
Yutaka KATUYAMA ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Optical Fibers
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