Change search
Link to record
Permanent link

Direct link
BETA
Publications (7 of 7) Show all publications
Amin, S., Tahira, A., Solangi, A. R., Mazzaro, R., Ibupoto, Z. H., Fatima, A. & Vomiero, A. (2020). Functional Nickel Oxide Nanostructures for Ethanol Oxidation in Alkaline Media. Electroanalysis
Open this publication in new window or tab >>Functional Nickel Oxide Nanostructures for Ethanol Oxidation in Alkaline Media
Show others...
2020 (English)In: Electroanalysis, ISSN 1040-0397, E-ISSN 1521-4109Article in journal (Refereed) Epub ahead of print
Abstract [en]

Nickel oxide (NiO) nanostructures are employed in the basic medium for the oxidation of ethanol. A variety of NiO nanostructures are synthesized by wet chemical growth method, using different hydroxide (OH−) ion sources, particularly from ammonia, hexamethylenetetramine, urea and sodium hydroxide. The use of urea as (OH−) ion source results in flower‐like NiO structures composed by extremely thin nanowalls (thickness lower than 10 nm,), which demonstrated to be the most active for ethanol oxidation. All the samples exhibit NiO cubic phase, and no other impurity was detected. The cyclic voltammetry (CV) curves of NiO nanostructures were found linear over the concentration range 0.1–3.5 mM (R2=0.99) of ethanol, with the limit of detection estimated to be 0.013 mM for ethanol. The NiO nanostructures exhibit a selective signal towards ethanol oxidation in the presence of different members of alcohol family. The proposed NiO nanostructures showed a significant practicality for the reproducible and sensitive determination of ethanol from brandy, whisky, mixture of brandy and rum, and vodka samples. The nanomaterial was used as a surface modifying agent for the glassy carbon electrode and it showed a stable electro‐oxidation activity for the ethanol for 16 days. These findings indicate that the presented NiO nanomaterial can be applied in place of noble metals for ethanol sensing and other environmental applications (like fuel cells).

Place, publisher, year, edition, pages
John Wiley & Sons, 2020
Keywords
NiO nanostructures, (OH−) ion source, ethanol oxidation, alkaline media
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-77972 (URN)10.1002/elan.201900662 (DOI)000507436500001 ()
Available from: 2020-03-05 Created: 2020-03-05 Last updated: 2020-03-05
Amin, S., Tahira, A., Solangi, A., Beni, V., Morante, J., Liu, X., . . . Vomiero, A. (2019). A practical non-enzymatic urea sensor based on NiCo2O4 nanoneedles. RSC Advances, 9(25), 14443-14451
Open this publication in new window or tab >>A practical non-enzymatic urea sensor based on NiCo2O4 nanoneedles
Show others...
2019 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, no 25, p. 14443-14451Article in journal (Refereed) Published
Abstract [en]

We propose a new facile electrochemical sensing platform for determination of urea, based on a glassy carbon electrode (GCE) modified with nickel cobalt oxide (NiCo2O4) nanoneedles. These nanoneedles are used for the first time for highly sensitive determination of urea with the lowest detection limit (1 μM) ever reported for the non-enzymatic approach. The nanoneedles were grown through a simple and low-temperature aqueous chemical method. We characterized the structural and morphological properties of the NiCo2O4 nanoneedles by TEM, SEM, XPS and XRD. The bimetallic nickel cobalt oxide exhibits nanoneedle morphology, which results from the self-assembly of nanoparticles. The NiCo2O4 nanoneedles are exclusively composed of Ni, Co, and O and exhibit a cubic crystalline phase. Cyclic voltammetry was used to study the enhanced electrochemical properties of a NiCo2O4 nanoneedle-modified GCE by overcoming the typical poor conductivity of bare NiO and Co3O4. The GCE-modified electrode is highly sensitive towards urea, with a linear response (R2 = 0.99) over the concentration range 0.01–5 mM and with a detection limit of 1.0 μM. The proposed non-enzymatic urea sensor is highly selective even in the presence of common interferents such as glucose, uric acid, and ascorbic acid. This new urea sensor has good viability for urea analysis in urine samples and can represent a significant advancement in the field, owing to the simple and cost-effective fabrication of electrodes, which can be used as a promising analytical tool for urea estimation.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-74362 (URN)10.1039/C9RA00909D (DOI)000468640100054 ()2-s2.0-85065663040 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-06-11 (johcin)

Available from: 2019-06-11 Created: 2019-06-11 Last updated: 2019-06-11Bibliographically approved
Amin, S., Tahira, A., Solangi, A., Mazzaro, R., Ibupoto, Z. & Vomiero, A. (2019). A sensitive enzyme-free lactic acid sensor based on NiO nanoparticles for practical applications. Analytical Methods, 11, 3578-3583
Open this publication in new window or tab >>A sensitive enzyme-free lactic acid sensor based on NiO nanoparticles for practical applications
Show others...
2019 (English)In: Analytical Methods, ISSN 1759-9660, E-ISSN 1759-9679, Vol. 11, p. 3578-3583Article in journal (Refereed) Published
Abstract [en]

A facile and efficient electrochemical sensing platform has been successfully exploited for the first time for the determination of lactic acid using a nickel oxide (NiO) nanoparticle-modified glassy carbon electrode (GCE). Nickel oxide nanoparticles were prepared by a chemical growth method using different quantities of arginine as a soft template. The structural and morphological properties of NiO nanoparticles were characterized by Raman spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). Cyclic voltammetry (CV) was used to study the electrochemical properties of various samples. The modified electrode is highly sensitive and presents a linear response over a wide range (0.005–5 mM) of lactic acid concentrations in 0.1 M NaOH. The detection limit for the sensor was found to be 5.7 μM, and it exhibits good stability. Furthermore, the sensor shows excellent selectivity in the presence of common interfering species. The lactic acid sensor showed good viability for lactic acid analysis in real samples (milk, yogurt and red wine) and demonstrated significant advancement in sensor technology for practical applications.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2019
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-75559 (URN)10.1039/C9AY00516A (DOI)000475986600010 ()2-s2.0-85069500109 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-08-16 (johcin)

Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-19Bibliographically approved
Tahira, A., Ibupoto, Z., Mazzaro, R., You, S., Morandi, V., Natile, M. M., . . . Vomiero, A. (2019). Advanced Electrocatalysts for Hydrogen Evolution Reaction Based on Core–Shell MoS2/TiO2 Nanostructures in Acidic and Alkaline Media. ACS APPLIED ENERGY MATERIALS, 2(3), 2053-2062
Open this publication in new window or tab >>Advanced Electrocatalysts for Hydrogen Evolution Reaction Based on Core–Shell MoS2/TiO2 Nanostructures in Acidic and Alkaline Media
Show others...
2019 (English)In: ACS APPLIED ENERGY MATERIALS, ISSN 2574-0962, Vol. 2, no 3, p. 2053-2062Article in journal (Refereed) Published
Abstract [en]

Hydrogen production as alternative energy source is still a challenge due to the lack of efficient and inexpensive catalysts, alternative to platinum. Thus, stable, earth abundant, and inexpensive catalysts are of prime need for hydrogen production via hydrogen evolution reaction (HER). Herein, we present an efficient and stable electrocatalyst composed of earth abundant TiO2 nanorods decorated with molybdenum disulfide thin nanosheets, a few nanometers thick. We grew rutile TiO2 nanorods via the hydrothermal method on conducting glass substrate, and then we nucleated the molybdenum disulfide nanosheets as the top layer. This composite possesses excellent hydrogen evolution activity in both acidic and alkaline media at considerably low overpotentials (350 mV and 700 mV in acidic and alkaline media, respectively) and small Tafel slopes (48 and 60 mV/dec in acidic and alkaline conditions, respectively), which are better than several transition metal dichalcogenides, such as pure molybdenum disulfide and cobalt diselenide. A good stability in acidic and alkaline media is reported here for the new MoS2/TiO2 electrocatalyst. These results demonstrate the potential of composite electrocatalysts for HER based on earth abundant, cost-effective, and environmentally friendly materials, which can also be of interest for a broader range of scalable applications in renewable energies, such as lithium sulfur batteries, solar cells, and fuel cells.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
acidic, alkaline, catalyst, hydrogen evolution reaction, MoS2, TiO2
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-73610 (URN)10.1021/acsaem.8b02119 (DOI)000462944700053 ()2-s2.0-85064810223 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-04-12 (oliekm)

Available from: 2019-04-12 Created: 2019-04-12 Last updated: 2019-06-24Bibliographically approved
Ibupoto, Z., Tahira, A., Tang, P., Liu, X., Morante, J. R., Fahlman, M., . . . Vomiero, A. (2019). MoSx@NiO Composite Nanostructures: An Advanced Nonprecious Catalyst for Hydrogen Evolution Reaction in Alkaline Media. Advanced Functional Materials, 29(7), Article ID 1807562.
Open this publication in new window or tab >>MoSx@NiO Composite Nanostructures: An Advanced Nonprecious Catalyst for Hydrogen Evolution Reaction in Alkaline Media
Show others...
2019 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 29, no 7, article id 1807562Article in journal (Refereed) Published
Abstract [en]

The design of the earth‐abundant, nonprecious, efficient, and stable electrocatalysts for efficient hydrogen evolution reaction (HER) in alkaline media is a hot research topic in the field of renewable energies. A heterostructured system composed of MoSx deposited on NiO nanostructures (MoSx@NiO) as a robust catalyst for water splitting is proposed here. NiO nanosponges are applied as cocatalyst for MoS2 in alkaline media. Both NiO and MoS2@NiO composites are prepared by a hydrothermal method. The NiO nanostructures exhibit sponge‐like morphology and are completely covered by the sheet‐like MoS2. The NiO and MoS2 exhibit cubic and hexagonal phases, respectively. In the MoSx@NiO composite, the HER experiment in 1 m KOH electrolyte results in a low overpotential (406 mV) to produce 10 mA cm−2 current density. The Tafel slope for that case is 43 mV per decade, which is the lowest ever achieved for MoS2‐based electrocatalyst in alkaline media. The catalyst is highly stable for at least 13 h, with no decrease in the current density. This simple, cost‐effective, and environmentally friendly methodology can pave the way for exploitation of MoSx@NiO composite catalysts not only for water splitting, but also for other applications such as lithium ion batteries, and fuel cells.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-72878 (URN)10.1002/adfm.201807562 (DOI)000459719800018 ()2-s2.0-85059344786 (Scopus ID)
Note

Validerad;2019;Nivå 2;2019-02-13 (johcin)

Available from: 2019-02-13 Created: 2019-02-13 Last updated: 2019-03-12Bibliographically approved
Willander, M., Tahira, A. & Ibupoto, Z. (2017). Potentiometric Biosensors Based on Metal Oxide Nanostructures. In: Jan Reedijk (Ed.), Reference Module in Chemistry, Molecular Sciences and Chemical Engineering: . Elsevier
Open this publication in new window or tab >>Potentiometric Biosensors Based on Metal Oxide Nanostructures
2017 (English)In: Reference Module in Chemistry, Molecular Sciences and Chemical Engineering / [ed] Jan Reedijk, Elsevier, 2017Chapter in book (Refereed)
Abstract [en]

Numerous potentiometric biosensors are fabricated via biocatalytic and bioaffinity-based biosensing mechanisms. Only few of them are useful and applicable to the biomedical application and analysis. The most of those sensing schemes are mainly related to the protein metabolism especially urea and creatinine. The emergence of nanoscience and nanotechnology in the biomedical applications has provided the solid platform for the development of sensitive and selective potentiometric biosensors as new generation analytical devices. Therefore, among the nanomaterials, metal oxides are of prime importance for the potentiometric analytical devices due to generation of strong potential signals and excellent biocompatibility with the proteins such as enzymes, antibodies, DNA, and biological cells. This book chapter is dedicated to the recent advancement in the development of potentiometric biosensors such as urea, uric acid, glucose, and cholesterol due to nanoscience from fundamental to advanced configuration approach of devices.

Place, publisher, year, edition, pages
Elsevier, 2017
National Category
Other Physics Topics
Research subject
Experimental physics
Identifiers
urn:nbn:se:ltu:diva-65921 (URN)10.1016/B978-0-12-409547-2.13482-1 (DOI)978-0-12-409547-2 (ISBN)
Note

This Reference Module contains trusted, peer-reviewed, comprehensive content from our reference works as curated by our world-class editorial board led by Editor-in-Chief, Jan Reedijk. It is designed for faster, more relevant browsing within the subject and beyond, with "Featured Articles" for quick, clear overviews, subject hierarchies to put everything in context, and guidance to lead researchers to related knowledge.

Available from: 2017-10-03 Created: 2017-10-03 Last updated: 2018-04-26Bibliographically approved
Izyumskaya, N., Tahira, A., Ibupoto, Z., Lewinski, N., Avrutin, V., Özgür, Ü., . . . Morkoç, H. (2017). Review-Electrochemical Biosensors Based on ZnO Nanostructures. ECS Journal of Solid State Science and Technology, 6(8), Q84-Q100
Open this publication in new window or tab >>Review-Electrochemical Biosensors Based on ZnO Nanostructures
Show others...
2017 (English)In: ECS Journal of Solid State Science and Technology, ISSN 2162-8769, E-ISSN 2162-8777, Vol. 6, no 8, p. Q84-Q100Article in journal (Refereed) Published
Abstract [en]

In recent years, electrochemical biosensors based on semiconductor and metal nanostructures have attracted a great deal of attention as new instruments in the healthcare arsenal that could substantially enhance early diagnostics capabilities and thus enable active health management. Among numerous materials studied, nanostructured ZnO has been recognized as a promising platform for biomedical applications owing to its low cost, relative ease of preparation leading to a rich variety of nanostructures with high aspect ratios (nanowires, nanobelts, nanoflakes), proven biocompatibility in the bulk form, electronic properties supporting various device types, and catalytic surface activity. In this contribution, we review the recent progress in development of enzymatic and non-enzymatic biosensors based on ZnO nanostructures. After a critical discussion of biocompatibility of nanostructured ZnO, we segue into the discussion of ZnO-based devices for detection of physiologically important analytes, including glucose, cholesterol, L-lactic acid, uric acid, metal ions, and pH. Special attention is given to ZnO nanorod based sensors for intracellular measurements

Place, publisher, year, edition, pages
Electrochemical Society, 2017
National Category
Other Physics Topics
Research subject
Experimental Physics
Identifiers
urn:nbn:se:ltu:diva-65879 (URN)10.1149/2.0291708jss (DOI)000409883900008 ()
Note

Validerad;2017;Nivå 2;2017-09-29 (andbra)

Available from: 2017-09-29 Created: 2017-09-29 Last updated: 2018-07-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6777-5642

Search in DiVA

Show all publications