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Article ; Online: Optoelectronic Neural Interfaces Based on Quantum Dots.

Han, Mertcan / Karatum, Onuralp / Nizamoglu, Sedat

ACS applied materials & interfaces

2022 Volume 14, Issue 18, Page(s) 20468–20490

Abstract: Optoelectronic modulation of neural activity is an emerging field for the investigation of neural circuits and the development of neural therapeutics. Among a wide variety of nanomaterials, colloidal quantum dots provide unique optoelectronic features ... ...

Abstract	Optoelectronic modulation of neural activity is an emerging field for the investigation of neural circuits and the development of neural therapeutics. Among a wide variety of nanomaterials, colloidal quantum dots provide unique optoelectronic features for neural interfaces such as sensitive tuning of electron and hole energy levels via the quantum confinement effect, controlling the carrier localization via band alignment, and engineering the surface by shell growth and ligand engineering. Even though colloidal quantum dots have been frontier nanomaterials for solar energy harvesting and lighting, their application to optoelectronic neural interfaces has remained below their significant potential. However, this potential has recently gained attention with the rise of bioelectronic medicine. In this review, we unravel the fundamentals of quantum-dot-based optoelectronic biointerfaces and discuss their neuromodulation mechanisms starting from the quantum dot level up to electrode-electrolyte interactions and stimulation of neurons with their physiological pathways. We conclude the review by proposing new strategies and possible perspectives toward nanodevices for the optoelectronic stimulation of neural tissue by utilizing the exceptional nanoscale properties of colloidal quantum dots.
MeSH term(s)	Electrodes ; Nanostructures ; Neurons ; Quantum Dots ; Solar Energy
Language	English
Publishing date	2022-04-28
Publishing country	United States
Document type	Journal Article ; Review
ISSN	1944-8252
ISSN (online)	1944-8252
DOI	10.1021/acsami.1c25009
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Fluorescent Proteins For Color-Conversion Light-Emitting Diodes

Sedat NIZAMOGLU

Süleyman Demirel üniversitesi fen bilimleri enstitüsü dergisi. 2016 Nov., v. 20, no. 3

2016

Abstract: Biologically derived fluorescent proteins are an attractive alternative to current color-conversion materials for solid state lighting applications, such as inorganic phosphors, organic dyes and nanocrystal quantum dots. Despite extensive research into ... ...

Abstract	Biologically derived fluorescent proteins are an attractive alternative to current color-conversion materials for solid state lighting applications, such as inorganic phosphors, organic dyes and nanocrystal quantum dots. Despite extensive research into fluorescent proteins for biological applications, they were not explored to be used for color-conversion for light-emitting diodes. In this study we investigate the in-solution characteristics of enhanced green fluorescent protein (eGFP) and monomeric cherry (mCherry) for LED applications. We demonstrate that these proteins can be used to completely convert the electroluminescence of a pump LED to photoluminescence. We show that up to typical pump driving current (150 mA) there is no saturation or bleaching of the proteins. Moreover, we compare the performance of in-solution unpurified and purified proteins as color convertors for LEDs and we show that unpurified fluorescent proteins in solution are suitable for color conversion applications.
Keywords	cherries ; color ; electrochemiluminescence ; fens ; fluorescence ; green fluorescent protein ; nanocrystals ; photoluminescence
Language	English
Dates of publication	2016-11
Size	p. 490-495.
Publishing place	Suleyman Demirel University
Document type	Article
ISSN	1308-6529
DOI	10.19113/sdufbed.89206
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Fluorescent Proteins For Color-Conversion Light-Emitting Diodes

Sedat NIZAMOGLU

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, Vol 20, Iss 3, Pp 490-

2016 Volume 495

Abstract	Biologically derived fluorescent proteins are an attractive alternative to current color-conversion materials for solid state lighting applications, such as inorganic phosphors, organic dyes and nanocrystal quantum dots. Despite extensive research into fluorescent proteins for biological applications, they were not explored to be used for color-conversion for light-emitting diodes. In this study we investigate the in-solution characteristics of enhanced green fluorescent protein (eGFP) and monomeric cherry (mCherry) for LED applications. We demonstrate that these proteins can be used to completely convert the electroluminescence of a pump LED to photoluminescence. We show that up to typical pump driving current (150 mA) there is no saturation or bleaching of the proteins. Moreover, we compare the performance of in-solution unpurified and purified proteins as color convertors for LEDs and we show that unpurified fluorescent proteins in solution are suitable for color conversion applications.
Keywords	Light emitting diodes ; Fluorescent proteins ; Photoluminescence ; Color Conversion ; Agriculture ; S ; Agriculture (General) ; S1-972 ; Technology (General) ; T1-995
Subject code	580
Language	English
Publishing date	2016-11-01T00:00:00Z
Publisher	Suleyman Demirel University
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: A Retina-Inspired Optoelectronic Synapse Using Quantum Dots for Neuromorphic Photostimulation of Neurons.

Balamur, Ridvan / Eren, Guncem Ozgun / Kaleli, Humeyra Nur / Karatum, Onuralp / Kaya, Lokman / Hasanreisoglu, Murat / Nizamoglu, Sedat

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

2024 , Page(s) e2401753

Abstract: Neuromorphic electronics, inspired by the functions of neurons, have the potential to enable biomimetic communication with cells. Such systems require operation in aqueous environments, generation of sufficient levels of ionic currents for ... ...

Abstract	Neuromorphic electronics, inspired by the functions of neurons, have the potential to enable biomimetic communication with cells. Such systems require operation in aqueous environments, generation of sufficient levels of ionic currents for neurostimulation, and plasticity. However, their implementation requires a combination of separate devices, such as sensors, organic synaptic transistors, and stimulation electrodes. Here, a compact neuromorphic synapse that combines photodetection, memory, and neurostimulation functionalities all-in-one is presented. The artificial photoreception is facilitated by a photovoltaic device based on cell-interfacing InP/ZnS quantum dots, which induces photo-faradaic charge-transfer mediated plasticity. The device sends excitatory post-synaptic currents exhibiting paired-pulse facilitation and post-tetanic potentiation to the hippocampal neurons via the biohybrid synapse. The electrophysiological recordings indicate modulation of the probability of action potential firing due to biomimetic temporal summation of excitatory post-synaptic currents. The results pave the way for the development of novel bioinspired neuroprosthetics and soft robotics and highlight the potential of quantum dots for achieving versatile neuromorphic functionality in aqueous environments.
Language	English
Publishing date	2024-03-06
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2808093-2
ISSN	2198-3844 ; 2198-3844
ISSN (online)	2198-3844
ISSN	2198-3844
DOI	10.1002/advs.202401753
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: A Retina-Inspired Optoelectronic Synapse Using Quantum Dots for Neuromorphic Photostimulation of Neurons.

Balamur, Ridvan / Eren, Guncem Ozgun / Kaleli, Humeyra Nur / Karatum, Onuralp / Kaya, Lokman / Hasanreisoglu, Murat / Nizamoglu, Sedat

Advanced science (Weinheim, Baden-Wurttemberg, Germany)

2024 , Page(s) e2306097

Abstract	Neuromorphic electronics, inspired by the functions of neurons, have the potential to enable biomimetic communication with cells. Such systems require operation in aqueous environments, generation of sufficient levels of ionic currents for neurostimulation, and plasticity. However, their implementation requires a combination of separate devices, such as sensors, organic synaptic transistors, and stimulation electrodes. Here, a compact neuromorphic synapse that combines photodetection, memory, and neurostimulation functionalities all-in-one is presented. The artificial photoreception is facilitated by a photovoltaic device based on cell-interfacing InP/ZnS quantum dots, which induces photo-faradaic charge-transfer mediated plasticity. The device sends excitatory post-synaptic currents exhibiting paired-pulse facilitation and post-tetanic potentiation to the hippocampal neurons via the biohybrid synapse. The electrophysiological recordings indicate modulation of the probability of action potential firing due to biomimetic temporal summation of excitatory post-synaptic currents. These results pave the way for the development of novel bioinspired neuroprosthetics and soft robotics, and highlight the potential of quantum dots for achieving versatile neuromorphic functionality in aqueous environments.
Language	English
Publishing date	2024-03-21
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2808093-2
ISSN	2198-3844 ; 2198-3844
ISSN (online)	2198-3844
ISSN	2198-3844
DOI	10.1002/advs.202306097
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Physical mechanisms of emerging neuromodulation modalities.

Karatum, Onuralp / Han, Mertcan / Erdogan, Ezgi Tuna / Karamursel, Sacit / Nizamoglu, Sedat

Journal of neural engineering

2023 Volume 20, Issue 3

Abstract: One of the ultimate goals of neurostimulation field is to design materials, devices and systems that can simultaneously achieve safe, effective and tether-free operation. For that, understanding the working mechanisms and potential applicability of ... ...

Abstract	One of the ultimate goals of neurostimulation field is to design materials, devices and systems that can simultaneously achieve safe, effective and tether-free operation. For that, understanding the working mechanisms and potential applicability of neurostimulation techniques is important to develop noninvasive, enhanced, and multi-modal control of neural activity. Here, we review direct and transduction-based neurostimulation techniques by discussing their interaction mechanisms with neurons via electrical, mechanical, and thermal means. We show how each technique targets modulation of specific ion channels (e.g. voltage-gated, mechanosensitive, heat-sensitive) by exploiting fundamental wave properties (e.g. interference) or engineering nanomaterial-based systems for efficient energy transduction. Overall, our review provides a detailed mechanistic understanding of neurostimulation techniques together with their applications to
MeSH term(s)	Neurons/physiology ; Electric Stimulation Therapy/instrumentation ; Electric Stimulation Therapy/methods ; Bioengineering
Language	English
Publishing date	2023-06-09
Publishing country	England
Document type	Journal Article ; Review ; Research Support, Non-U.S. Gov't
ZDB-ID	2170901-4
ISSN	1741-2552 ; 1741-2560
ISSN (online)	1741-2552
ISSN	1741-2560
DOI	10.1088/1741-2552/acd870
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Optoelectronic Neural Interfaces Based on Quantum Dots

Han, Mertcan / Karatum, Onuralp / Nizamoglu, Sedat

ACS applied materials & interfaces. 2022 Apr. 28, v. 14, no. 18

2022

Abstract	Optoelectronic modulation of neural activity is an emerging field for the investigation of neural circuits and the development of neural therapeutics. Among a wide variety of nanomaterials, colloidal quantum dots provide unique optoelectronic features for neural interfaces such as sensitive tuning of electron and hole energy levels via the quantum confinement effect, controlling the carrier localization via band alignment, and engineering the surface by shell growth and ligand engineering. Even though colloidal quantum dots have been frontier nanomaterials for solar energy harvesting and lighting, their application to optoelectronic neural interfaces has remained below their significant potential. However, this potential has recently gained attention with the rise of bioelectronic medicine. In this review, we unravel the fundamentals of quantum-dot-based optoelectronic biointerfaces and discuss their neuromodulation mechanisms starting from the quantum dot level up to electrode–electrolyte interactions and stimulation of neurons with their physiological pathways. We conclude the review by proposing new strategies and possible perspectives toward nanodevices for the optoelectronic stimulation of neural tissue by utilizing the exceptional nanoscale properties of colloidal quantum dots.
Keywords	energy ; ligands ; lighting ; medicine ; quantum dots ; solar energy ; therapeutics
Language	English
Dates of publication	2022-0428
Size	p. 20468-20490.
Publishing place	American Chemical Society
Document type	Article
ISSN	1944-8252
DOI	10.1021/acsami.1c25009
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Optical neuromodulation at all scales: from nanomaterials to wireless optoelectronics and integrated systems.

Karatum, Onuralp / Gwak, Min-Jun / Hyun, Junghun / Onal, Asim / Koirala, Gyan Raj / Kim, Tae-Il / Nizamoglu, Sedat

Chemical Society reviews

2023 Volume 52, Issue 10, Page(s) 3326–3352

Abstract: Light-based neuromodulation systems offer exceptional spatiotemporal resolution combined with the elimination of physical tether to communicate with neurons. Currently, optical neuromodulation systems ranging from the nano to the centimeter scale enable ... ...

Abstract	Light-based neuromodulation systems offer exceptional spatiotemporal resolution combined with the elimination of physical tether to communicate with neurons. Currently, optical neuromodulation systems ranging from the nano to the centimeter scale enable neural activity control from the single cell to the organ level in retina, heart, spinal cord, and brain, facilitating a wide range of experiments in intact and freely moving animals in different contexts, such as during social interactions and behavioral tasks. Nanotransducers (
MeSH term(s)	Animals ; Wireless Technology ; Brain/physiology ; Prostheses and Implants ; Neurons ; Nanostructures
Language	English
Publishing date	2023-05-22
Publishing country	England
Document type	Journal Article ; Review
ZDB-ID	1472875-8
ISSN	1460-4744 ; 0306-0012
ISSN (online)	1460-4744
ISSN	0306-0012
DOI	10.1039/d2cs01020h
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Cation exchange mediated synthesis of bright Au@ZnTe core-shell nanocrystals.

Sadeghi, Sadra / Melikov, Rustamzhon / Sahin, Mehmet / Nizamoglu, Sedat

Nanotechnology

2020 Volume 32, Issue 2, Page(s) 25603

Abstract: The synthesis of heterostructured core-shell nanocrystals has attracted significant attention due to their wide range of applications in energy, medicine and environment. To further extend the possible nanostructures, non-epitaxial growth is introduced ... ...

Abstract	The synthesis of heterostructured core-shell nanocrystals has attracted significant attention due to their wide range of applications in energy, medicine and environment. To further extend the possible nanostructures, non-epitaxial growth is introduced to form heterostructures with large lattice mismatches, which cannot be achieved by classical epitaxial growth techniques. Here, we report the synthetic procedure of Au@ZnTe core-shell nanostructures by cation exchange reaction for the first time. For that, bimetallic Au@Ag heterostructures were synthesized by using PDDA as stabilizer and shape-controller. Then, by addition of Te and Zn precursors in a step-wise reaction, the zinc and silver cation exchange was performed and Au@ZnTe nanocrystals were obtained. Structural and optical characterization confirmed the formation of the Au@ZnTe nanocrystals. The optimization of the synthesis led to the bright nanocrystals with a photoluminescence quantum yield up to 27%. The non-toxic, versatile synthetic route, and bright emission of the synthesized Au@ZnTe nanocrystals offer significant potential for future bio-imaging and optoelectronic applications.
Language	English
Publishing date	2020-11-11
Publishing country	England
Document type	Journal Article
ZDB-ID	1362365-5
ISSN	1361-6528 ; 0957-4484
ISSN (online)	1361-6528
ISSN	0957-4484
DOI	10.1088/1361-6528/abbb02
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Protocol on synthesis and characterization of copper-doped InP/ZnSe quantum dots as ecofriendly luminescent solar concentrators with high performance and large area.

Eren, Guncem Ozgun / Sadeghi, Sadra / Shahzad, Mehwish / Nizamoglu, Sedat

STAR protocols

2021 Volume 2, Issue 3, Page(s) 100664

Abstract: Luminescent solar concentrators (LSCs) are simple and cost-effective solar energy-harvesting devices. Indium phosphide (InP)-based colloidal quantum dots (QDs) are promising QDs for efficient LSC devices due to their environmentally benign nature. One ... ...

Abstract	Luminescent solar concentrators (LSCs) are simple and cost-effective solar energy-harvesting devices. Indium phosphide (InP)-based colloidal quantum dots (QDs) are promising QDs for efficient LSC devices due to their environmentally benign nature. One major challenge in LSC devices is reabsorption losses. To minimize the reabsorption, Stokes shift engineering is a critical process to designing the QD material. Here, we present a protocol that contains the preparation of structurally engineered copper-doped InP/ZnSe QDs and their LSC application. For complete details on the use and execution of this protocol, please refer to Sadeghi et al. (2020).
MeSH term(s)	Copper/chemistry ; Equipment Design ; Indium/chemistry ; Luminescence ; Luminescent Measurements/instrumentation ; Luminescent Measurements/methods ; Phosphines/chemistry ; Quantum Dots/chemistry ; Selenium Compounds/chemistry ; Solar Energy ; Spectrophotometry, Ultraviolet ; Zinc Compounds/chemistry
Chemical Substances	Phosphines ; Selenium Compounds ; Zinc Compounds ; Indium (045A6V3VFX) ; Copper (789U1901C5) ; zinc selenide (OWX23150D5) ; indium phosphide (SD36LG60G1)
Language	English
Publishing date	2021-07-09
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ISSN	2666-1667
ISSN (online)	2666-1667
DOI	10.1016/j.xpro.2021.100664
Database	MEDical Literature Analysis and Retrieval System OnLINE

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