Humidity Sensing by Chitosan-Coated Fibre Bragg Gratings (FBG)

D’Amato, Rosaria; Polimadei, Andrea; Terranova, G.; Caponero, M.

doi:10.3390/s21103348

Cited by 22 publications

(7 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nearly identical pore size distributions of sensors 1 and 2 before and after loading HPTS were extracted from nitrogen adsorption–desorption isotherms (Figure d and Figures S4–S6), indicating that nanopores in HMO capsules remain unchanged during HPTS loading, which may be attributed to the extraordinarily large BET surface areas (1388 m 2 /g for sensor 1 and 1284 m 2 /g for sensor 2) of HMO capsules. To investigate the fluorescence color change response at different static RHs, the fluorescence spectra of tested sensors were measured by sealing the sensor between O-ring spaced quartz slides together with drops of saturated LiCl, MgCl 2 , K 2 CO 3 , NaBr, NaCl, and KCl solutions and water, which correspond to ambient RHs of 10, 33, 44, 58, 75, 85, and 99%, respectively. − …”

Section: Resultsmentioning

confidence: 99%

Photoacid-Loaded Nanopores of Hollow Mesoporous Organosilica Capsules for Fluorescent Humidity Sensing

Guo

Sha

Wang

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Humidity sensing has a wide application and receives intense attention from a broad spectrum of research areas. In this work, we demonstrated a robust humidity sensing strategy by loading photoacid HPTS (8-hydroxypyrene-1,3,6-trisulfonic acid, trisodium salt) into nanopores of hollow mesoporous organosilica (HMO) capsules. Taking advantage of the capillary condensation of nanopores, water vapor is enriched, which triggers the fluorescent color change of HPTS through intermolecular excited-state proton transfer (ESPT) for humidity sensing. The ESPT induced fluorescent color change behavior of HPTS loaded in nanopores was comprehensively investigated by using both steady and picosecond time-resolved fluorescence spectroscopy. The fabricated humidity sensors exhibit rapid response and recovery, qualified reversibility, and selectivity, which enable continuous monitoring of human respiration. Notably, the sensing performance, i.e., sensitivity and response range, can be effectively tuned by fabricating HMO capsules with properly sized nanopores, which provides an opportunity to design unique nanostructures of the humidity sensor for specific applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Photoacid-Loaded Nanopores of Hollow Mesoporous Organosilica Capsules for Fluorescent Humidity Sensing

Guo

Sha

Wang

et al. 2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…The CH coating was deposited on the FBG sensor as a solution prepared by dissolving low molecular weight CH with a concentration of 5% wt. in 2% v / v aqueous solution of acetic acid following the procedure in [ 49 ]. All chemicals were reagent grade from Sigma-Aldrich ® , St. Louis, MO, USA).…”

Section: The Fbg-based Plant Wearables: Design Fabrication and Working Principlesmentioning

confidence: 99%

Plant Wearable Sensors Based on FBG Technology for Growth and Microclimate Monitoring

Presti

Cimini

Massaroni

et al. 2021

Sensors

Self Cite

View full text Add to dashboard Cite

Plants are primary resources for oxygen and foods whose production is fundamental for our life. However, diseases and pests may interfere with plant growth and cause a significant reduction of both the quality and quantity of agriculture products. Increasing agricultural productivity is crucial for poverty reduction and food security improvements. For this reason, the 2030 Agenda for Sustainable Development gives a central role to agriculture by promoting a strong technological innovation for advancing sustainable practices at the plant level. To accomplish this aim, recently, wearable sensors and flexible electronics have been extended from humans to plants for measuring elongation, microclimate, and stressing factors that may affect the plant’s healthy growth. Unexpectedly, fiber Bragg gratings (FBGs), which are very popular in health monitoring applications ranging from civil infrastructures to the human body, are still overlooked for the agriculture sector. In this work, for the first time, plant wearables based on FBG technology are proposed for the continuous and simultaneous monitoring of plant growth and environmental parameters (i.e., temperature and humidity) in real settings. The promising results demonstrated the feasibility of FBG-based sensors to work in real situations by holding the promise to advance continuous and accurate plant health growth monitoring techniques.

show abstract

“…Other examples are hydrophilic gelatin [148], cobalt chloride hydrate [149], and graphene oxide [150]. Other strategies involve chitosan, a polysaccharide, which is a hydroscopic polymer, meaning that it causes swelling when in contact with water, and is measurable using a FBG [151]. Yet another technique is the use of a metal-organic framework [152]; a metal coordinated with organic ligands, which have mesoscale pores that absorb gas molecules.…”

Section: Water Vapourmentioning

confidence: 99%

A Review: Application and Implementation of Optic Fibre Sensors for Gas Detection

Allsop

Neal

2021

Sensors

View full text Add to dashboard Cite

At the present time, there are major concerns regarding global warming and the possible catastrophic influence of greenhouse gases on climate change has spurred the research community to investigate and develop new gas-sensing methods and devices for remote and continuous sensing. Furthermore, there are a myriad of workplaces, such as petrochemical and pharmacological industries, where reliable remote gas tests are needed so that operatives have a safe working environment. The authors have concentrated their efforts on optical fibre sensing of gases, as we became aware of their increasing range of applications. Optical fibre gas sensors are capable of remote sensing, working in various environments, and have the potential to outperform conventional metal oxide semiconductor (MOS) gas sensors. Researchers are studying a number of configurations and mechanisms to detect specific gases and ways to enhance their performances. Evidence is growing that optical fibre gas sensors are superior in a number of ways, and are likely to replace MOS gas sensors in some application areas. All sensors use a transducer to produce chemical selectivity by means of an overlay coating material that yields a binding reaction. A number of different structural designs have been, and are, under investigation. Examples include tilted Bragg gratings and long period gratings embedded in optical fibres, as well as surface plasmon resonance and intra-cavity absorption. The authors believe that a review of optical fibre gas sensing is now timely and appropriate, as it will assist current researchers and encourage research into new photonic methods and techniques.

show abstract

Humidity Sensing by Chitosan-Coated Fibre Bragg Gratings (FBG)

Cited by 22 publications

References 37 publications

Photoacid-Loaded Nanopores of Hollow Mesoporous Organosilica Capsules for Fluorescent Humidity Sensing

Photoacid-Loaded Nanopores of Hollow Mesoporous Organosilica Capsules for Fluorescent Humidity Sensing

Plant Wearable Sensors Based on FBG Technology for Growth and Microclimate Monitoring

A Review: Application and Implementation of Optic Fibre Sensors for Gas Detection

Contact Info

Product

Resources

About