liu.seSearch for publications in DiVA
Change search
Link to record
Permanent link

Direct link
BETA
Hussain Ibupoto, Zafar
Alternative names
Publications (10 of 67) Show all publications
Ali, A., Israr-Qadir, M., Wazir, Z., Tufail, M., Ibupoto, Z. H., Jamil-Rana, S., . . . Willander, M. (2015). Cobalt oxide magnetic nanoparticles-chitosan nanocomposite based electrochemical urea biosensor. Indian Journal of Physics, 89(4), 331-336
Open this publication in new window or tab >>Cobalt oxide magnetic nanoparticles-chitosan nanocomposite based electrochemical urea biosensor
Show others...
2015 (English)In: Indian Journal of Physics, ISSN 0973-1458, E-ISSN 0974-9845, Vol. 89, no 4, p. 331-336Article in journal (Refereed) Published
Abstract [en]

In this study, a potentiometric urea biosensor has been fabricated on glass filter paper through the immobilization of urease enzyme onto chitosan/cobalt oxide (CS/Co3O4) nanocomposite. A copper wire with diameter of 500 mu m is attached with nanoparticles to extract the voltage output signal. The shape and dimensions of Co3O4 magnetic nanoparticles are investigated by scanning electron microscopy and the average diameter is approximately 80-100 nm. Structural quality of Co3O4 nanoparticles is confirmed from X-ray powder diffraction measurements, while the Raman spectroscopy has been used to understand the chemical bonding between different atoms. The magnetic measurement has confirmed that Co3O4 nanoparticles show ferromagnetic behavior, which could be attributed to the uncompensated surface spins and/or finite size effects. The ferromagnetic order of Co3O4 nanoparticles is raised with increasing the decomposition temperature. A physical adsorption method is adopted to immobilize the surface of CS/Co3O4 nanocomposite. Potentiometric sensitivity curve has been measured over the concentration range between 1 x 10(-4) and 8 x 10(-2) M of urea electrolyte solution revealing that the fabricated biosensor holds good sensing ability with a linear slope curve of similar to 45 mV/decade. In addition, the presented biosensor shows good reusability, selectivity, reproducibility and resistance against interferers along with the stable output response of similar to 12 s.

Place, publisher, year, edition, pages
Springer Verlag (Germany), 2015
Keywords
Potentiometric biosensors; Metal oxide; Nanoparticles and urea sensing
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-117212 (URN)10.1007/s12648-014-0594-3 (DOI)000351564800004 ()
Note

Funding Agencies|King Saud University, Deanship of Scientific Research, College of Science Research Center

Available from: 2015-04-22 Created: 2015-04-21 Last updated: 2018-02-27
Elhag, S., Ibupoto, Z. H., Khranovskyy, V., Willander, M. & Nour, O. (2015). Habit-modifying additives and their morphological consequences on photoluminescence and glucose sensing properties of ZnO nanostructures, grown via aqueous chemical synthesis. Vacuum, 116, 21-26
Open this publication in new window or tab >>Habit-modifying additives and their morphological consequences on photoluminescence and glucose sensing properties of ZnO nanostructures, grown via aqueous chemical synthesis
Show others...
2015 (English)In: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 116, p. 21-26Article in journal (Refereed) Published
Abstract [en]

Generally, the anisotropic shape of inorganic nano-crystal can be influenced by one or more of different parameters i.e. kinetic energy barrier, temperature, time, and the nature of the capping molecules. Here, different surfactants acting as capping molecules were used to assist the aqueous chemical growth of zinc oxide (ZnO) nanostructures on Au coated glass substrates. The morphology, crystal quality and the photoluminescence (PL) properties of the ZnO nanostructures were investigated. The PL properties of the prepared ZnO nanostructures at room temperature showed a dominant UV luminescence peak, while the "green yellow" emissions were essentially suppressed. Moreover, the ZnO nanostructures were investigated for the development of a glucose biosensor. An adsorbed molecule has direct contribution on the glucose oxidase/ZnO/Au sensing properties. We show that the performance of a ZnO-based biosensor can be improved by tailoring the properties of the ZnO biomolecule interface through engineering of the morphology, effective surface area, and adsorption capability.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
ZnO nanostructures; Cationic and anionic molecules; PL spectra; Glucose sensitivity
National Category
Physical Chemistry
Identifiers
urn:nbn:se:liu:diva-119245 (URN)10.1016/j.vacuum.2015.02.026 (DOI)000354582900004 ()
Note

Funding Agencies|University of Kordofan Grant, El-Obeid, Kordofan Sudan [700]

Available from: 2015-06-15 Created: 2015-06-12 Last updated: 2017-12-04
Khun, K., Elhag, S., Ibupoto, Z. H., Khranovskyy, V., Nur, O. & Willander, M. (2015). Supramolecules-assisted ZnO nanostructures growth and their UV photodetector application. Solid State Sciences, 41, 14-18
Open this publication in new window or tab >>Supramolecules-assisted ZnO nanostructures growth and their UV photodetector application
Show others...
2015 (English)In: Solid State Sciences, ISSN 1293-2558, E-ISSN 1873-3085, Vol. 41, p. 14-18Article in journal (Refereed) Published
Abstract [en]

Zinc oxide (ZnO) nanosheets, nickel oxide (NiO) nanoflowers and their nanocomposite were grown on the fluorine doped tin oxide (FTO) substrate. The supramolecules-assisted ZnO growth by a hydrothermal method used to tune the morphology of the grown ZnO nanostructures to nanosheets morphology. The synthesis, purity and the optical properties of the grown material were characterized by scanning electron microscopy (SEM), x-ray diffraction (XRD), UV-visible spectrometry and photoluminescence (PL) analysis. The current-voltage (I-V) characterization of the ZnO/NiO heterojunction was performed at room temperature and showed an obvious nonlinear and rectifying response. A strong UV absorption with fast switching was observed from the ZnO/NiO composite heterojunction. The proposed UV photodetector based on this nano-composite is more stable, possesses fast rising and decaying time response approximately 100 ms and low leakage current was investigated. The findings indicate that the importance of the use of controlled nanostructures morphology for developing efficient nanodevices for various applications

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
ZnO/NiO nano-composite; UV absorption ZnO; nano-heterojunction; UV photodetector
National Category
Physical Sciences Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-112863 (URN)10.1016/j.solidstatesciences.2015.01.011 (DOI)000350888800003 ()
Note

On the day of the defence date the status of this article was Manuscript.

Available from: 2014-12-18 Created: 2014-12-18 Last updated: 2017-12-05Bibliographically approved
Ibupoto, Z. H., Khun, K., Liu, X. & Willander, M. (2014). A Potentiometric Biosensor for the Detection of Notch 3 Using Functionalized ZnO Nanorods. Journal of Nanoscience and Nanotechnology, 14(9), 6704-6710
Open this publication in new window or tab >>A Potentiometric Biosensor for the Detection of Notch 3 Using Functionalized ZnO Nanorods
2014 (English)In: Journal of Nanoscience and Nanotechnology, ISSN 1533-4880, E-ISSN 1533-4899, Vol. 14, no 9, p. 6704-6710Article in journal (Refereed) Published
Abstract [en]

The notch signalling plays a vital and radical role for the activity of cellular proliferation, differentiation and apoptosis. In this study, for the first time a particular biosensor is developed for the detection of notch 3. ZnO nanorods were fabricated on the gold coated glass substrate by hydrothermal method and afterwards were decorated with the gold nanoparticles by electrodepositing technique. Scanning electron microscopy (SEM) has shown the perpendicular to the substrate growth pattern of ZnO nanorods. X-ray diffraction (XRD) studies showed the c-axis oriented growth direction with wurtzite crystal structure of ZnO nanorods. X-ray Photoelectron Spectroscopy (XPS) and energy dispersive X-ray (EDX) techniques have shown the presence of Zn, O and Au atoms in the prepared functional material. Furthermore, the anti-notch 3 was physically adsorbed on the gold nanoparticles functionalized ZnO nanorods. The developed potentiometric immunosensor has shown response to the wide range of notch 3 molecules. The detected range included 1.00 x 10(-5)-1.50 x 10(0) mu g/mL with a sensitivity of 23.15 +/- 0.31 mV/decade. The analytical parameters including reproducibility, stability, and selectivity were also investigated and the observed results indicate the acceptable performance of the notch 3 biosensor. Moreover, the proposed notch 3 biosensor exhibited a fast response time of 10 s.

Place, publisher, year, edition, pages
American Scientific Publishers, 2014
Keywords
Gold Nanoparticles; ZnO Nanorods; Potentiometric Technique; Immunosensor; Anti-Notch 3; Notch 3 of Human
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-107434 (URN)10.1166/jnn.2014.9374 (DOI)000335873900029 ()
Available from: 2014-06-12 Created: 2014-06-12 Last updated: 2017-12-05Bibliographically approved
Khun, K., Ibupoto, Z. H., Liu, X., Nur, O., Willander, M. & Danielsson, B. (2014). A Selective Potentiometric Copper (II) Ion Sensor Based on the Functionalized ZnO Nanorods. Journal of Nanoscience and Nanotechnology, 14(9), 6723-6731
Open this publication in new window or tab >>A Selective Potentiometric Copper (II) Ion Sensor Based on the Functionalized ZnO Nanorods
Show others...
2014 (English)In: Journal of Nanoscience and Nanotechnology, ISSN 1533-4880, E-ISSN 1533-4899, Vol. 14, no 9, p. 6723-6731Article in journal (Refereed) Published
Abstract [en]

In this work, ZnO nanorods were hydrothermally grown on the gold-coated glass substrate and characterized by field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD) techniques. The ZnO nanorods were functionalized by two different approaches and performance of the sensor electrode was monitored. Fourier transform infrared spectroscopy (FTIR) was carried out for the confirmation of interaction between the ionophore molecules and ZnO nanorods. In addition to this, the surface of the electrode was characterized by X-ray photoelectron spectroscopy (XPS) showing the chemical and electronic state of the ionophore and ZnO nanorod components. The ionophore solution was prepared in the stabilizer, poly vinyl chloride (PVC) and additives, and then functionalized on the ZnO nanorods that have shown the Nernstian response with the slope of 31 mV/decade. However, the Cu2+ ion sensor was fabricated only by immobilizing the selective copper ion ionophore membrane without the use of PVC, plasticizers, additives and stabilizers and the sensor electrode showed a linear potentiometric response with a slope of 56.4 mV/decade within a large dynamic concentration range (from 1.0 x 10(-6) to 1.0 x 10(-1) M) of copper (II) nitrate solutions. The sensor showed excellent repeatability and reproducibility with response time of less than 10 s. The negligible response to potentially interfering metal ions such as calcium (Ca2+), magnesium (Mg2+), potassium (K+), iron (Fe3+), zinc (Zn2+), and sodium (Na+) allows this sensor to be used in biological studies. It may also be used as an indicator electrode in the potentiometric titration.

Place, publisher, year, edition, pages
American Scientific Publishers, 2014
Keywords
ZnO Nanorods; Ionophore; Cu+2 Ion; Potentiometric Sensor; Indicator Electrode
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-107436 (URN)10.1166/jnn.2014.9377 (DOI)000335873900032 ()
Available from: 2014-06-12 Created: 2014-06-12 Last updated: 2017-12-05Bibliographically approved
Khun, K., Ibupoto, Z. H., Liu, X., Mansor, N. A., Turner, A., Beni, V. & Willander, M. (2014). An Electrochemical Dopamine Sensor Based on the ZnO/CuO Nanohybrid Structures. Journal of Nanoscience and Nanotechnology, 14(9), 6646-6652
Open this publication in new window or tab >>An Electrochemical Dopamine Sensor Based on the ZnO/CuO Nanohybrid Structures
Show others...
2014 (English)In: Journal of Nanoscience and Nanotechnology, ISSN 1533-4880, E-ISSN 1533-4899, Vol. 14, no 9, p. 6646-6652Article in journal (Refereed) Published
Abstract [en]

The selective detection of dopamine (DA) is of great importance in the modern medicine because dopamine is one of the main regulators in human behaviour. In this study, ZnO/CuO nanohybrid structures, grown on the gold coated glass substrate, have been investigated as a novel electrode material for the electrochemical detection of dopamine. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) techniques were used for the material characterization and the obtained results are in good agreement. The selective determination of dopamine was demonstrated by cyclic voltammetry (CV) and amperometric experiments. The amperometric response was linear for dopamine concentrations between 1.0 x 10(-3) and 8.0 mM with a sensitivity of 90.9 mu A mM(-1) cm(-2). The proposed dopamine biosensor is very stable, selective over common interferents as glucose, uric acid and ascorbic acid, and also good reproducibility was observed for seven electrodes. Moreover, the dopamine sensor exhibited a fast response time of less than 10 s. The wide range and acceptable sensitivity of the presented dopamine sensor provide the possible application in analysing the dopamine from the real samples.

Place, publisher, year, edition, pages
American Scientific Publishers, 2014
Keywords
Dopamine; ZnO/CuO Nanohybrid Structures; Cyclic Voltammetry; Amperometry
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-107432 (URN)10.1166/jnn.2014.9367 (DOI)000335873900020 ()
Available from: 2014-06-12 Created: 2014-06-12 Last updated: 2017-12-05Bibliographically approved
Khan, A., Hussain, M., Ali Abbasi, M., Hussain Ibupoto, Z., Nur, O. & Willander, M. (2014). Analysis of junction properties of gold-zinc oxide nanorods-based Schottky diode by means of frequency dependent electrical characterization on textile. Journal of Materials Science, 49(9), 3434-3441
Open this publication in new window or tab >>Analysis of junction properties of gold-zinc oxide nanorods-based Schottky diode by means of frequency dependent electrical characterization on textile
Show others...
2014 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 49, no 9, p. 3434-3441Article in journal (Refereed) Published
Abstract [en]

Present work is an effort to reveal the junction properties of gold/zinc oxide (ZnO) nanorods-based Schottky diode by using the frequency dependent electrical properties. The most important electrical parameters such as conductance, resistance, capacitance, and impedance were studied as function of frequency across the series of AC voltages. Moreover, current density-voltage (J-V) was measured to know the performance of present Schottky diode. The effect of native defects was also studied by using cathodoluminescence spectroscopy measured at different accelerating voltage. The textile substrate was used for the growth of ZnO nanorods by using the aqueous chemical growth method and Schottky diode fabrication. Diode fabrication on textile fabric is a step forward toward the fabrication of electronic devices on nonconventional, economical, soft, light weight, flexible, wearable, washable, recyclable, reproducible, and nontoxic substrate.

Place, publisher, year, edition, pages
Springer Verlag (Germany), 2014
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-105403 (URN)10.1007/s10853-014-8053-2 (DOI)000331388000016 ()
Available from: 2014-03-21 Created: 2014-03-21 Last updated: 2018-02-16
Abbasi, M. A., Hussain Ibupoto, Z., Hussain, M., Pozina, G., Lu, J., Hultman, L., . . . Willander, M. (2014). Decoration of ZnO nanorods with coral reefs like NiO nanostructures by the hydrothermal growth method and their luminescence study. Materials, 7(1), 430-440
Open this publication in new window or tab >>Decoration of ZnO nanorods with coral reefs like NiO nanostructures by the hydrothermal growth method and their luminescence study
Show others...
2014 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 7, no 1, p. 430-440Article in journal (Refereed) Published
Abstract [en]

Composite nanostructures of coral reefs like p-type NiO on n-type ZnO nanorods have been decorate on fluorine-doped tin oxide glass substrates by the hydrothermal growth. Structural characterization was performed by field emission scanning electron microscopy,  high-resolution transmission electron microscopy and X-ray diffraction techniques. This investigation has shown that the adopted synthesis has led to high crystalline quality nanostructures. Morphological study shows that the coral reefs like nanostructures are densely packed on the ZnO nanorods. Cathodoluminescence (CL) spectra for the synthesized composite nanostructures were dominated by a near band gap emission at 380 nm and by a broad interstitial defect related luminescence centered at ~630 nm. Spatially resolved CL images reveal that the luminescence originates mainly from the ZnO nanorods.

Place, publisher, year, edition, pages
MDPI, 2014
Keywords
ZnO nanorods; NiO nanostructure; composite nanostructures; defect states; cathodoluminescent
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-103339 (URN)10.3390/ma7010430 (DOI)000336088500030 ()
Available from: 2014-01-17 Created: 2014-01-17 Last updated: 2018-07-20Bibliographically approved
Mansor, N. A., Zain, Z. M., Hamzah, H. H., Noorden, M. S., Jaapar, S. S., Beni, V. & Ibupoto, Z. H. (2014). Detection of Breast Cancer 1 (BRCA1) Gene Using an Electrochemical DNA Biosensor Based on Immobilized ZnO Nanowires. Open Journal of Applied Biosensor, 3(2), 9-17
Open this publication in new window or tab >>Detection of Breast Cancer 1 (BRCA1) Gene Using an Electrochemical DNA Biosensor Based on Immobilized ZnO Nanowires
Show others...
2014 (English)In: Open Journal of Applied Biosensor, ISSN 2168-5401, Vol. 3, no 2, p. 9-17Article in journal (Refereed) Published
Abstract [en]

Herein we report an electrochemical DNA biosensor for the rapid detection of sequence (5’ AAT GGA TTT ATC TGC TCT TCG 3’) specific for the breast cancer 1 (BRCA1) gene. The proposed electrochemical genosensor is based on short oligonucleotide DNA probe immobilized onto zinc oxide nanowires (ZnONWs) chemically synthesized onto gold electrode via hydrothermal technique. The morphology studies of the ZnONWs, performed by field emission scanning electron microscopy (FESEM), showed that the ZnO nanowires are uniform, highly dense and oriented perpendicularly to the substrate. Recognition event between the DNA probe and the target was investigated by differential pulse voltammetry (DPV) in 0.1 M acetate buffer solution (ABS), pH 7.00; as a result of the hybridization, an oxidation signal was observed at +0.8 V. The influences of pH, target concentration, and non-complimentary DNA on biosensor performance were examined. The proposed DNA biosensor has the ability to detect the target sequence in the range of concentration between 10.0 and 100.0 µM with a detection limit of 3.32 µM. The experimental results demonstrated that the prepared ZnONWs/Au electrodes are suitable platform for the immobilization of DNA.

Place, publisher, year, edition, pages
Scientific Research Publishing, 2014
Keywords
Zinc Oxide Nanowires, DNA Biosensor, Breast Cancer Gene, BRCA1, DNA Hybridization, Differential, Pulse Voltammetry
National Category
Nano Technology
Identifiers
urn:nbn:se:liu:diva-107958 (URN)10.4236/ojab.2014.32002 (DOI)
Available from: 2014-06-24 Created: 2014-06-24 Last updated: 2017-03-01Bibliographically approved
Ibupoto, Z. H., Khun, K. & Willander, M. (2014). Development of a pH Sensor Using Nanoporous Nanostructures of NiO. Journal of Nanoscience and Nanotechnology, 14(9), 6699-6703
Open this publication in new window or tab >>Development of a pH Sensor Using Nanoporous Nanostructures of NiO
2014 (English)In: Journal of Nanoscience and Nanotechnology, ISSN 1533-4880, E-ISSN 1533-4899, Vol. 14, no 9, p. 6699-6703Article in journal (Refereed) Published
Abstract [en]

Glass is the conventional material used in pH electrodes to monitor pH in various applications. However, the glass-based pH electrode has some limitations for particular applications. The glass sensor is limited in the use of in vivo biomedical, clinical or food applications because of the brittleness of glass, its large size, the difficulty in measuring small volumes and the absence of deformation (inflexibility). Nanostructure-based pH sensors are very sensitive, reliable, fast and applicable towards in vivo measurements. In this study, nanoporous NiO nanostructures are synthesized on a gold-coated glass substrate by a hydrothermal route using poly(vinyl alcohol) (PVA) as a stabilizer. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used for the morphological and crystalline studies. The grown NiO nanostructures are uniform and dense, and they possess good crystallinity. A pH sensor based on these NiO nanostructures was developed by testing the different pH values from 2-12 of phosphate buffered saline solution. The proposed pH sensor showed robust sensitivity of -43.74 +/- 0.80 mV/pH and a quick response time of less than 10 s. Moreover, the repeatability, reproducibility and stability of the presented pH sensor were also studied.

Place, publisher, year, edition, pages
American Scientific Publishers, 2014
Keywords
pH Sensor; Nickel Oxide; Nanoporous; Buffer Solution
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-107433 (URN)10.1166/jnn.2014.9373 (DOI)000335873900028 ()
Available from: 2014-06-12 Created: 2014-06-12 Last updated: 2017-12-05Bibliographically approved
Organisations

Search in DiVA

Show all publications