An amperometric nitrate sensor based on well-aligned cone-shaped polypyrrole-nanorods

Tu, Xiaochen; Rong, Yonghua; Lü, Qing; Zhou, Yikai; Lu, Zequn

doi:10.1039/c2ay26007g

Cited by 9 publications

(9 citation statements)

References 20 publications

(14 reference statements)

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“…It is an important environmental and human health analyte, and thus its detection and quantication are considered to be essential. An excellent review on the detection and determination has been reported by Moorcro et al 1 Recently, various instrumental methods based on spectrophotometry, 2-4 chromatography [5][6][7] and voltammetry [8][9][10] have been developed for this purpose. The use of spectroscopic analysis appears to be the method of choice due to the simplicity of the protocols and the wide availability of the instrumentation involved.…”

Section: Introductionmentioning

confidence: 99%

A sensitive and fast electrochemical sensor based on copper nanostructures for nitrate determination in foodstuffs and mineral waters

Hafezi

Majidi

2013

Anal. Methods

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Section: Introductionmentioning

confidence: 99%

A sensitive and fast electrochemical sensor based on copper nanostructures for nitrate determination in foodstuffs and mineral waters

Hafezi

Majidi

2013

Anal. Methods

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“…PPy has been studied experimentally for the variety of simple and complex analytes including gaseous molecules (NH 3 25 , NO 2 26 , H 2 O 2 27 , H 2 28 , CO 2 29 , H 2 S), ions (Zn 2+ 30 , ammonium ions, nitrate 31 and nitrite 32 ), or complex molecular structures (DNA) 33 Nitrate ion is a key component in nitrogen cycle, and connects nitrification and denitrification. Moreover, nitrates are widely used as fertilizers and oxidizing agents 34 . Since all nitrates are essentially water soluble, therefore, excessive use of fertilizers increases the concentration of nitrate in surface and groundwater 35 .…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, nitrates are widely used as fertilizers and oxidizing agents. 34 Since all nitrates are essentially water soluble, excessive use of fertilizers increases the concentration of nitrate in surface and groundwater. 35 Despite these advantages, an excess amount of nitrate ions (beyond the recommended limits) causes several problems to living organisms.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, consistent and efficient determination of NO 3 À is required. Experimentally, polypyrrole (PPy) based electrochemical sensors are reported for the determination of nitrate; 34,38,39 however, theoretical insight into the interaction of nitrate anions with polypyrrole has not been obtained. We became interested in the theoretical studies of polypyrrole nitrate sensors.…”

Section: Introductionmentioning

confidence: 99%

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An accurate cost effective DFT approach to study the sensing behaviour of polypyrrole towards nitrate ions in gas and aqueous phases

Wasim

Mahmood

Ayub

2016

Phys. Chem. Chem. Phys.

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Density functional theory (DFT) calculations have been performed to study the response of polypyrrole towards nitrate ions in gas and aqueous phases. First, an accurate estimate of interaction energies is obtained by methods calibrated against the gold standard CCSD(T) method. Then, a number of low cost DFT methods are also evaluated for their ability to accurately estimate the binding energies of polymer-nitrate complexes. The low cost methods evaluated here include dispersion corrected potential (DCP), Grimme's D3 correction, counterpoise correction of the B3LYP method, and Minnesota functionals (M05-2X). The interaction energies calculated using the counterpoise (CP) correction and DCP methods at the B3LYP level are in better agreement with the interaction energies calculated using the calibrated methods. The interaction energies of an infinite polymer (polypyrrole) with nitrate ions are calculated by a variety of low cost methods in order to find the associated errors. The electronic and spectroscopic properties of polypyrrole oligomers nPy (where n = 1-9) and nPy-NO3(-) complexes are calculated, and then extrapolated for an infinite polymer through a second degree polynomial fit. Charge analysis, frontier molecular orbital (FMO) analysis and density of state studies also reveal the sensing ability of polypyrrole towards nitrate ions. Interaction energies, charge analysis and density of states analyses illustrate that the response of polypyrrole towards nitrate ions is considerably reduced in the aqueous medium (compared to the gas phase).

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“…These are some of the reasons to monitor nitrate ions in the environment. Extensive studies have been explored to detect the nitrate ions using different techniques, such as ion chromatography [18], capillary electrophoresis [3,20], electrochemical [3,[21][22][23][24], and fluorescence spectroscopy [17]. However, the detection limit and linear detection range of existing nitrate ion sensor are still not in satisfactory level [21], and this urges researchers to develop better nitrate sensors.…”

Section: Introductionmentioning

confidence: 99%

Polyvinylpyrrolidone as a New Fluorescent Sensor for Nitrate Ion

Ing¹,

Sundari²,

Lintang³

et al. 2016

MJAS

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In this study, non-conjugated polyvinylpyrrolidone(PVP) was investigated for the first time as the potential polymeric material to sense nitrate ions by fluorescence spectroscopy. The PVP was diluted into various concentrations (3-10%) and they were used to sense the nitrate ions in different concentrations (0.1-100 mM). The PVP showed two excitation peaks at 285 and 330 nm due to the presence of C=O and N-C groups, respectively. One strong emission at 400 or 408 nm was observed with the excitation at 285 or 330 nm. The higher value of quenching constant at excitation wavelength of 285 nm indicated that C=O site was more favored for NO 3 -ions sensing than the N-C site. The PVP 7% gave the highest quenching constant; where the K SV value was 9.89 × 10 -3 mM -1 and 2.44 × 10 -3 mM -1 for excitation at 285 and 330 nm, respectively. The sensing capability was evaluated in the presence of interference ions (SO 4 2-, HCO 3 -, Cl -, and OH -). It was observed that the interference ions interacted strongly with the C=O, but weakly with the N-C. Therefore, in the presence of the interference ions, the PVP would be a potential fluorescent sensor when it is excited at 330 nm.Keywords: polyvinylpyrrolidone; fluorescent sensor; nitrate ions; quenching Abstrak Dalam kajian ini, polivinilpirolidon (PVP) yang bersifat bukan konjugat dikaji untuk kali pertama sebagai bahan polimer yang berpotensi untuk mengesan ion nitrat dengan spektroskopi pendaflour. PVP dicairkan kepada kepekatan yang berlainan (3-10%) dan digunakan untuk mengesan ion nitrat dalam kepekatan yang berbeza (0.1-100 mM). PVP menunjukkan dua puncak pengujaan pada 285 and 330 nm dengan kewujudan C=O dan N-C masing-masing. Satu puncak pemancaran yang tinggi pada 400 atau 408 nm diperolehi dengan pengujaan pada 285 atau 330 nm. Pemalar pelidap kejutan dengan nilai yang lebih tinggi pada puncak pengujaan 285 nm menunjukkan bahawa tapak C=O lebih cenderung untuk mengesan ion NO 3 -daripada tapak N-C. PVP 7% memberi pemalar pelidap kejutan yang paling tinggi, dengan nilai K SV 9.89 × 10 -3 mM -1 and 2.44 × 10 -3 mM -1 untuk puncak pengujaan pada 285 dan 330 nm masing-masing. Kemampuan pengesanan dinilai dengan kehadiran ion gangguan (SO 4 2-, HCO 3 -, OH -, and Cl -). Hasil kajian menunjukkan bahawa ion gangguan berinteraksi kuat dengan C=O, tetapi lemah dengan N-C. Oleh itu, dengan kehadiran ion gangguan, PVP berpotensi menjadi pendafluor sensor pada tapak pengujaan 330 nm.Kata kunci: polivinilpirolidon; pengesan pendaflour, ion nitrat, pelidap kejutan

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An amperometric nitrate sensor based on well-aligned cone-shaped polypyrrole-nanorods

Cited by 9 publications

References 20 publications

A sensitive and fast electrochemical sensor based on copper nanostructures for nitrate determination in foodstuffs and mineral waters

A sensitive and fast electrochemical sensor based on copper nanostructures for nitrate determination in foodstuffs and mineral waters

An accurate cost effective DFT approach to study the sensing behaviour of polypyrrole towards nitrate ions in gas and aqueous phases

Polyvinylpyrrolidone as a New Fluorescent Sensor for Nitrate Ion

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