scholarly journals Investigation of Acetone Vapour Sensing Properties of a Ternary Composite of Doped Polyaniline, Reduced Graphene Oxide and Chitosan Using Surface Plasmon Resonance Biosensor

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2750
Author(s):  
Fahad Usman ◽  
John Ojur Dennis ◽  
E M Mkawi ◽  
Yas Al-Hadeethi ◽  
Fabrice Meriaudeau ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Invasive Monitoring ◽  
Ternary Composite ◽  
Non Invasive ◽  
Spr Sensor ◽  
Reduced Graphene ◽  
Acetone Vapour ◽  
Doped Polyaniline

This work reports the use of a ternary composite that integrates p-Toluene sulfonic acid doped polyaniline (PANI), chitosan, and reduced graphene oxide (RGO) as the active sensing layer of a surface plasmon resonance (SPR) sensor. The SPR sensor is intended for application in the non-invasive monitoring and screening of diabetes through the detection of low concentrations of acetone vapour of less than or equal to 5 ppm, which falls within the range of breath acetone concentration in diabetic patients. The ternary composite film was spin-coated on a 50-nm-thick gold layer at 6000 rpm for 30 s. The structure, morphology and chemical composition of the ternary composite samples were characterized by FTIR, UV-VIS, FESEM, EDX, AFM, XPS, and TGA and the response to acetone vapour at different concentrations in the range of 0.5 ppm to 5 ppm was measured at room temperature using SPR technique. The ternary composite-based SPR sensor showed good sensitivity and linearity towards acetone vapour in the range considered. It was determined that the sensor could detect acetone vapour down to 0.88 ppb with a sensitivity of 0.69 degree/ppm with a linearity correlation coefficient of 0.997 in the average SPR angular shift as a function of the acetone vapour concentration in air. The selectivity, repeatability, reversibility, and stability of the sensor were also studied. The acetone response was 87%, 94%, and 99% higher compared to common interfering volatile organic compounds such as propanol, methanol, and ethanol, respectively. The attained lowest detection limit (LOD) of 0.88 ppb confirms the potential for the utilisation of the sensor in the non-invasive monitoring and screening of diabetes.

scholarly journals Quantitative and Selective Surface Plasmon Resonance Response Based on a Reduced Graphene Oxide–Polyamidoamine Nanocomposite for Detection of Dengue Virus E-Proteins

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 569 ◽  
Author(s):  
Nur Alia Sheh Omar ◽  
Yap Wing Fen ◽  
Jaafar Abdullah ◽  
Amir Reza Sadrolhosseini ◽  
Yasmin Mustapha Kamil ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Dengue Virus ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
E Proteins ◽  
Spr Sensor ◽  
Amine Functionalized ◽  
Reduced Graphene

Dengue viral infection is one of the most common deadliest diseases and has become a recurrent issue for public health in tropical countries. Although the spectrum of clinical diagnosis and treatment have recently been established, the efficient and rapid detection of dengue virus (DENV) during viremia and the early febrile phase is still a great challenge. In this study, a dithiobis (succinimidyl undecanoate, DSU)/amine-functionalized reduced graphene oxide-–polyamidoamine dendrimer (DSU/amine-functionalized rGO–PAMAM) thin film-based surface plasmon resonance (SPR) sensor was developed for the detection of DENV 2 E-proteins. Different concentrations of DENV 2 E-proteins were successfully tested by the developed SPR sensor-based system. The performance of the developed sensor showed increased shift in the SPR angle, narrow full-width–half-maximum of the SPR curve, high detection accuracy, excellent figure of merit and signal-to-noise ratio, good sensitivity values in the range of 0.08–0.5 pM (S = 0.2576°/pM, R2 = 0.92), and a high equilibrium association constant (KA) of 7.6452 TM−1. The developed sensor also showed a sensitive and selective response towards DENV 2 E-proteins compared to DENV 1 E-proteins and ZIKV (Zika virus) E-proteins. Overall, it was concluded that the Au/DSU/amine-functionalized rGO–PAMAM thin film-based SPR sensor has potential to serve as a rapid clinical diagnostic tool for DENV infection.

scholarly journals Enhanced Sensitivity of Surface Plasmon Resonance Biosensor Functionalized with Doped Polyaniline Composites for the Detection of Low-Concentration Acetone Vapour

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Fahad Usman ◽  
John Ojur Dennis ◽  
Khe Cheng Seong ◽  
Abdelaziz Yousif Ahmed ◽  
Thomas L. Ferrell ◽  
...  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Refractive Index Change ◽  
Ternary Composite ◽  
Low Concentration ◽  
Spr Sensor ◽  
Enhanced Sensitivity ◽  
Vis Spectroscopy ◽  
Acetone Vapour

PANI/chitosan composite and a ternary composite comprising of PANI, chitosan, and reduced graphene oxide have been successfully synthesised and characterised using FTIR and UV-VIS spectroscopy. Optical constants of the composites were extracted from the UV-VIS spectra. The extracted parameters were applied in the simulation of a surface plasmon resonance (SPR) biosensor functionalised with PANI/chitosan and ternary composites. The aim was to explore the applicability of the composite-based SPR sensor in the detection of low-concentration acetone vapour within the range of 1.8 ppm–5.0 ppm for diabetes monitoring and screening. The functionalization of the SPR sensor with the PANI/chitosan and the ternary composites shows promising application of the sensor in the detection of acetone vapour at a low concentration down to less than 0.5 ppm. The maximum sensitivity values of about 60 and 180 degree/refractive index change were observed for PANI/chitosan and ternary composite sensing layers, respectively, in comparison with the bare gold-based SPR which shows no response up to 10 ppm concentration of acetone vapour in air. In addition, the two sensing layers show good selectivity to acetone vapour compared to ethanol, methanol, and ammonia. The response in the case of ternary composite shows better linearity with a correlation coefficient of 1.0 compared to PANI/chitosan- and gold-based SPR layers with 0.9999 and 0.9997, respectively.

scholarly journals Boron-Doped Reduced Graphene Oxide with Tunable Bandgap and Enhanced Surface Plasmon Resonance

Molecules ◽  
2020 ◽  
Vol 25 (16) ◽  
pp. 3646 ◽  
Author(s):  
Muhammad Junaid ◽  
M. H. Md Khir ◽  
Gunawan Witjaksono ◽  
Nelson Tansu ◽  
Mohamed Shuaib Mohamed Saheed ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
High Performance ◽  
Light Sensing ◽  
Tunable Bandgap ◽  
Boron Doped ◽  
Reduced Graphene ◽  
Enhanced Surface

Graphene and its hybrids are being employed as potential materials in light-sensing devices due to their high optical and electronic properties. However, the absence of a bandgap in graphene limits the realization of devices with high performance. In this work, a boron-doped reduced graphene oxide (B-rGO) is proposed to overcome the above problems. Boron doping enhances the conductivity of graphene oxide and creates several defect sites during the reduction process, which can play a vital role in achieving high-sensing performance of light-sensing devices. Initially, the B-rGO is synthesized using a modified microwave-assisted hydrothermal method and later analyzed using standard FESEM, FTIR, XPS, Raman, and XRD techniques. The content of boron in doped rGO was found to be 6.51 at.%. The B-rGO showed a tunable optical bandgap from 2.91 to 3.05 eV in the visible spectrum with an electrical conductivity of 0.816 S/cm. The optical constants obtained from UV-Vis absorption spectra suggested an enhanced surface plasmon resonance (SPR) response for B-rGO in the theoretical study, which was further verified by experimental investigations. The B-rGO with tunable bandgap and enhanced SPR could open up the solution for future high-performance optoelectronic and sensing applications.

Synthesis of a Pt/reduced graphene oxide/polydopamine composite material for localized surface plasmon resonance and methanol electrocatalysis

2018 ◽  
Vol 42 (24) ◽  
pp. 19458-19466 ◽  
Author(s):  
Hongtao Wang ◽  
Shixiang Lu ◽  
Wenguo Xu ◽  
Bei Wu ◽  
Ge He ◽  
...  
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Reduced Graphene Oxide ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Localized Surface Plasmon ◽  
Cycle Stability ◽  
Reduced Graphene

Pt NPs are synthesized and loaded with rGO onto ITO using polydopamine. The strongest LSPR effect corresponds to the optimal catalyst. The catalyst has a good anti-poison property against CO and shows good cycle stability.

The surface plasmon resonance, thermal, support and size effect induced photocatalytic activity enhancement of Au/reduced graphene oxide for selective oxidation of benzylic alcohols

2017 ◽  
Vol 19 (46) ◽  
pp. 31389-31398 ◽  
Author(s):  
Yanhui Zhang ◽  
Hongxu Guo ◽  
Wen Weng ◽  
Ming-Lai Fu
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Size Effect ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Size Effects ◽  
Benzylic Alcohols ◽  
Reduced Graphene ◽  
Activity Enhancement

The SPR, thermal, support, and size effects of Au/RGO are demonstrated to play an important role in enhancing the photocatalytic activity.

Continuous Detection of Pb(II) utilizing Chitosan-Graphene Oxide Surface Plasmon Resonance Sensors based on Ag/Au and Au/Ag/Au Nanolayers

2021 ◽  
Author(s):  
Nur Hasiba Kamaruddin ◽  
Nur Hidayah Azeman ◽  
Mohd Hadri Hafiz Mokhtar ◽  
Ahmad Ashrif A Bakar
Keyword(s):  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Simple Approach ◽  
Oxide Surface ◽  
Ion Detection ◽  
Spr Sensor ◽  
Linearity Range ◽  
The One

This work demonstrates the effect of Ag/Au and Au/Ag/Au nanolayers on the performance of chitosan (CS)-graphene oxide (GO) surface plasmon resonance (SPR) sensors for Pb(II) ion detection. The CS-GO SPR sensors are  fabricated on a bi-metallic 40 nm Ag/10 nm Au and tri-metallic 10 nm Au/40 nm Ag/10 nm Au nanolayers. The  sensors are tested with Pb(II) ion solution of concentrations 0.1 to 5 ppm using SPR spectroscopy. The results show  that the CS-GO SPR sensor on the bimetallic Ag/Au gives a gradual shift in SPR angle from 0.1 to 1 ppm and slightly  linear from 3 to 5 ppm. Meanwhile, the CS-GO SPR sensor on the tri-metallic Au/Ag/Au nanolayers provides an  extended linearity range from 1 to 5 ppm with the highest shift in SPR angle of 1.8o. Additionally, the tri-metallic CS-GO SPR sensor also exhibits the greatest SNR of 0.25 as compared to 0.15 of the one on the bi-metallic nanolayers.  Thus, the studies prove that the tri-metallic Au/Ag/Au nanolayer is an effective and simple approach to improve the performance of a CS-GO SPR sensor for Pb(II) ion detection.

H2S bubbles-assisted synthesis of hollow Cu2−xSeyS1−y/reduced graphene oxide nanocomposites with tunable compositions and localized surface plasmon resonance

RSC Advances ◽  
2015 ◽  
Vol 5 (111) ◽  
pp. 91206-91212 ◽  
Author(s):  
Wen Long Li ◽  
Hong Yan Zou ◽  
Jing Lan ◽  
Qiang Wang ◽  
Yuan Fang Li ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Localized Surface Plasmon Resonance ◽  
Room Temperature ◽  
Localized Surface Plasmon ◽  
Gas Bubble ◽  
One Pot ◽  
Reduced Graphene

Homogeneous hollow Cu2−xSeyS1−y/rGO nanocomposites are controllably synthesized by a facile one-pot aqueous chemical approach via H2S gas bubble templates at room temperature, using a nonhazardous reducing agent, ascorbic acid.

Sign in / Sign up

Export Citation Format

Share Document