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Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions

Recently, we discovered that the polymeric metal-free carbon nitride (CN) is a potential fluorescence sensor for detection of nitrate (NO3-) ions. However, since the NO3- usually exists together with nitrite ions (NO2-), development of fluorescence sensor for detection of both NO3- and NO2- is an im...

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Main Authors: Alim, Nor Shuhada, Lintang, Hendrik O., Yuliati, Leny
Format: Conference or Workshop Item
Published: 2015
Subjects:
QD Chemistry
Online Access:http://eprints.utm.my/id/eprint/61623/
https://iupac.org/event/4th-federation-of-asian-polymer-societies-international-polymer-congress-4th-faps-ipc-2105/
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spelling my.utm.616232017-04-26T04:03:50Z http://eprints.utm.my/id/eprint/61623/ Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions Alim, Nor Shuhada Lintang, Hendrik O. Yuliati, Leny QD Chemistry Recently, we discovered that the polymeric metal-free carbon nitride (CN) is a potential fluorescence sensor for detection of nitrate (NO3-) ions. However, since the NO3- usually exists together with nitrite ions (NO2-), development of fluorescence sensor for detection of both NO3- and NO2- is an important issue. In this study, we evaluated the performance of the CN as the fluorescence sensor for NO2- detection. The CN was prepared through thermal polymerization of urea precursor at 823 K in closed condition and was characterized by using diffuse reflectance ultraviolet-visible (DR UV-Vis), Fourier transform infrared (FTIR), and fluorescence spectroscopies. The DR UV-Vis spectrum confirmed that CN could absorb light up to 450 nm. The FTIR spectrum revealed the presence of graphitic CN single and double bond characters in the 800 to 1700 cm-1 area, while the fluorescence spectroscopy confirmed that only one emission peak was found at 453 nm when CN was excited at wavelength 278, 310 and 369 nm which due to the presence of C=N, C=O and N-C groups, respectively. In this study, the capability of CN as fluorescence sensor was investigated via fluorescence quenching of different concentration of NO2- in the range of 0.5 to 4 ?M. It was confirmed that the emission intensities of all emission sites of CN were quenched linearly with the concentration of NO2-. Based on the linear Stern-Volmer plots, the interactions between emission sites and the NO2- would occur more favourably at C=N and C=O sites than N-C sites. The quenching rate on the C=N sites towards the NO2- was determined to be 0.14 ʯM-1, which was much higher than the reported value for the NO3- detection. This study demonstrated that CN was more sensitive towards the detection of the NO2-. Reproducibility tests were carried out to study the repeatability as the fluorescence sensor. It was confirmed that the CN showed good repeatability, supporting its application as the sensitive fluorescence sensor towards the NO2. 2015 Conference or Workshop Item PeerReviewed Alim, Nor Shuhada and Lintang, Hendrik O. and Yuliati, Leny (2015) Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions. In: The 4th Federation of Asian Polymer Societies International Polymer Congress (4FAPS-IPC 2015), 5-8 Oct, 2015, Kuala Lumpur, Malaysia. https://iupac.org/event/4th-federation-of-asian-polymer-societies-international-polymer-congress-4th-faps-ipc-2105/
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
topic QD Chemistry
spellingShingle QD Chemistry
Alim, Nor Shuhada
Lintang, Hendrik O.
Yuliati, Leny
Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions
description Recently, we discovered that the polymeric metal-free carbon nitride (CN) is a potential fluorescence sensor for detection of nitrate (NO3-) ions. However, since the NO3- usually exists together with nitrite ions (NO2-), development of fluorescence sensor for detection of both NO3- and NO2- is an important issue. In this study, we evaluated the performance of the CN as the fluorescence sensor for NO2- detection. The CN was prepared through thermal polymerization of urea precursor at 823 K in closed condition and was characterized by using diffuse reflectance ultraviolet-visible (DR UV-Vis), Fourier transform infrared (FTIR), and fluorescence spectroscopies. The DR UV-Vis spectrum confirmed that CN could absorb light up to 450 nm. The FTIR spectrum revealed the presence of graphitic CN single and double bond characters in the 800 to 1700 cm-1 area, while the fluorescence spectroscopy confirmed that only one emission peak was found at 453 nm when CN was excited at wavelength 278, 310 and 369 nm which due to the presence of C=N, C=O and N-C groups, respectively. In this study, the capability of CN as fluorescence sensor was investigated via fluorescence quenching of different concentration of NO2- in the range of 0.5 to 4 ?M. It was confirmed that the emission intensities of all emission sites of CN were quenched linearly with the concentration of NO2-. Based on the linear Stern-Volmer plots, the interactions between emission sites and the NO2- would occur more favourably at C=N and C=O sites than N-C sites. The quenching rate on the C=N sites towards the NO2- was determined to be 0.14 ʯM-1, which was much higher than the reported value for the NO3- detection. This study demonstrated that CN was more sensitive towards the detection of the NO2-. Reproducibility tests were carried out to study the repeatability as the fluorescence sensor. It was confirmed that the CN showed good repeatability, supporting its application as the sensitive fluorescence sensor towards the NO2.
format Conference or Workshop Item
author Alim, Nor Shuhada
Lintang, Hendrik O.
Yuliati, Leny
author_facet Alim, Nor Shuhada
Lintang, Hendrik O.
Yuliati, Leny
author_sort Alim, Nor Shuhada
title Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions
title_short Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions
title_full Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions
title_fullStr Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions
title_full_unstemmed Fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions
title_sort fluorescence sensor based on metal-free polymeric carbon nitride for detection of nitrite ions
publishDate 2015
url http://eprints.utm.my/id/eprint/61623/
https://iupac.org/event/4th-federation-of-asian-polymer-societies-international-polymer-congress-4th-faps-ipc-2105/
_version_ 1643655221808726016
score 13.211869

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