1
|
Shreteh K, Murugesan S, Alkrenawi I, Afik N, Volokh M, Mokari T. Unconventional Synthesis of Metal (Ni, Co, Ag) Antimony Alloy Particles. Inorg Chem 2024; 63:431-440. [PMID: 38105628 DOI: 10.1021/acs.inorgchem.3c03299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
Bimetallic alloy materials attract interest owing to their properties and stability compared to pure metals, especially alloys with nanoscale dimensions. Metal antimony (MSb) alloys, specifically NiSb, are widely used for charge storage applications due to their high stability. Most synthetic approaches to form these materials require drastic conditions (e.g., high temperatures, potent reducing agents, and extended reaction times), limiting control over the final morphology. The other viable approach is a galvanic replacement that uses unstable materials as precursors. In this work, we present a new and facile method to prepare several MSb (M = Ni, Co, Ag) alloys with shape control by reacting Sb2S3 particles with a metal(M)-sulfide single source precursor in trioctylphosphine (TOP) under mild conditions. Furthermore, we explore the role of TOP as a reducing agent and demonstrate how both alloy constituents are crucial for mutual stabilization. Electrochemical studies are also performed on these NiSb particles, showing their ambipolar nature and allowing their utilization as the active ingredient in the demonstrated high-energy-density symmetric supercapacitor.
Collapse
Affiliation(s)
- Karam Shreteh
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Sandhiya Murugesan
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Iman Alkrenawi
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Noa Afik
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Michael Volokh
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Taleb Mokari
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
- Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| |
Collapse
|
2
|
Volokh M, Mokari T. Metal/semiconductor interfaces in nanoscale objects: synthesis, emerging properties and applications of hybrid nanostructures. NANOSCALE ADVANCES 2020; 2:930-961. [PMID: 36133041 PMCID: PMC9418511 DOI: 10.1039/c9na00729f] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 02/04/2020] [Indexed: 05/11/2023]
Abstract
Hybrid nanostructures, composed of multi-component crystals of various shapes, sizes and compositions are much sought-after functional materials. Pairing the ability to tune each material separately and controllably combine two (or more) domains with defined spatial orientation results in new properties. In this review, we discuss the various synthetic mechanisms for the formation of hybrid nanostructures of various complexities containing at least one metal/semiconductor interface, with a focus on colloidal chemistry. Different synthetic approaches, alongside the underlying kinetic and thermodynamic principles are discussed, and future advancement prospects are evaluated. Furthermore, the proved unique properties are reviewed with emphasis on the connection between the synthetic method and the resulting physical, chemical and optical properties with applications in fields such as photocatalysis.
Collapse
Affiliation(s)
- Michael Volokh
- Department of Chemistry, Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev Beer-Sheva 8410501 Israel
| | - Taleb Mokari
- Department of Chemistry, Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev Beer-Sheva 8410501 Israel
| |
Collapse
|
3
|
Marcovici A, Le Saux G, Bhingardive V, Rukenstein P, Flomin K, Shreteh K, Golan R, Mokari T, Schvartzman M. Directed Assembly of Au-Tipped 1D Inorganic Nanostructures via Nanolithographic Docking. ACS NANO 2018; 12:10016-10023. [PMID: 30252443 DOI: 10.1021/acsnano.8b04443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Controlled assembly of nanostructures is a key challenge in nanotechnology. In this work, we introduce an approach for the controlled assembly of 1D nanodumbbells-Au-tipped semiconductor nanorods-into arbitrary 2D higher architectures, by their chemical docking to nanopatterned functionalities. We realized the docking functionalities via nanoimprinted metallic nanodots functionalized with an organic monolayer, whose terminal thiol groups chemically bind the nanodumbbell tips. We demonstrated that the functional nanopattern encodes the nanodumbbell assembly and can be designed to deterministically position nanodumbbells in two possible modes. In the single-docking mode, the nanodot arrays are designed with a spacing that exceeds the nanodumbbell length, restricting each nanodumbbell to dock with one edge and physically connect with its free edge to one of the neighboring nanodumbbells. Alternatively, in the double-docking mode, the nanodots are spaced to exactly fit the nanodumbbell length, allowing nanodumbbell docking with both edges. We found that the docking kinetics can be described by a random attachment model, and verified that for the used docking chemistry, nanodumbbells that are docked to the same dot do not interact with each other. Our work demonstrates the possibility for massively parallel positioning of sub-100 nm 1D semiconductor nanostructures, and can potentially enable their future integration into functional nanodevices and nanosystems.
Collapse
|
4
|
Electrophoretic deposition of single-source precursors as a general approach for the formation of hybrid nanorod array heterostructures. J Colloid Interface Sci 2018; 515:221-231. [PMID: 29335188 DOI: 10.1016/j.jcis.2018.01.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 01/07/2018] [Accepted: 01/08/2018] [Indexed: 11/22/2022]
Abstract
HYPOTHESIS Subjecting colloids to electric fields often results in (electrophoretic) deposition on conductive substrates. Dispersing a single-source precursor (SSP) of choice in an appropriate solvent, should allow its deposition on different substrates. The SSP-solvent interaction might play a role in the deposition (e.g., direction, rate, coverage). After thermal decomposition, the SSPs convert to the designed material, thus allowing formation of thin films or hybrid nanostructures. EXPERIMENTS Electrophoretic deposition (EPD) was applied on two representative SSPs in different solvents. These SSPs were deposited onto substrates covered with vertically-aligned ZnO nanorod (NR) arrays. After thermal decomposition, hybrid nanostructures were obtained and their morphology and interfaces were characterized by electron microscopy, X-ray diffraction, UV-vis, and electrochemistry. FINDINGS Tuning the organic dispersant-SSP interaction allows control over the final film morphology, which can result in coating and filling of NRs with metal-sulfides or metal-oxides after thermal decomposition of the SSP. These findings introduce a new facile method for a fast and large-scale uniform deposition of different (nanostructured) thin film semiconductors on a variety of substrates. We discuss the influence of the dispersant medium on the deposition of metallo-organic SSPs. As an example, the formed ZnO-CdS interface supports charge transfer upon illumination.
Collapse
|
5
|
Abstract
![]()
Pairs of coupled quantum dots with controlled coupling between
the two potential wells serve as an extremely rich system, exhibiting
a plethora of optical phenomena that do not exist in each of the isolated
constituent dots. Over the past decade, coupled quantum systems have
been under extensive study in the context of epitaxially grown quantum
dots (QDs), but only a handful of examples have been reported with
colloidal QDs. This is mostly due to the difficulties in controllably
growing nanoparticles that encapsulate within them two dots separated
by an energetic barrier via colloidal synthesis methods. Recent advances
in colloidal synthesis methods have enabled the first clear demonstrations
of colloidal double quantum dots and allowed for the first exploratory
studies into their optical properties. Nevertheless, colloidal double
QDs can offer an extended level of structural manipulation that allows
not only for a broader range of materials to be used as compared with
epitaxially grown counterparts but also for more complex control over
the coupling mechanisms and coupling strength between two spatially
separated quantum dots. The photophysics of these nanostructures is governed by the balance
between two coupling mechanisms. The first is via dipole–dipole
interactions between the two constituent components, leading to energy
transfer between them. The second is associated with overlap of excited
carrier wave functions, leading to charge transfer and multicarrier
interactions between the two components. The magnitude of the coupling
between the two subcomponents is determined by the detailed potential
landscape within the nanocrystals (NCs). One of the hallmarks of double QDs is the observation of dual-color
emission from a single nanoparticle, which allows for detailed spectroscopy
of their properties down to the single particle level. Furthermore,
rational design of the two coupled subsystems enables one to tune
the emission statistics from single photon emission to classical emission.
Dual emission also provides these NCs with more advanced functionalities
than the isolated components. The ability to better tailor the emission
spectrum can be advantageous for color designed LEDs in lighting and
display applications. The different response of the two emission colors
to external stimuli enables ratiometric sensing. Control over hot
carrier dynamics within such structures allows for photoluminescence
upconversion. This Account first provides a description of the main hurdles toward
the synthesis of colloidal double QDs and an overview of the growing
library of synthetic pathways toward constructing them. The main discoveries
regarding their photophysical properties are then described in detail,
followed by an overview of potential applications taking advantage
of the double-dot structure. Finally, a perspective and outlook for
their future development is provided.
Collapse
Affiliation(s)
- Ayelet Teitelboim
- Department of Physics of
Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Noga Meir
- Department of Physics of
Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Miri Kazes
- Department of Physics of
Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel
| | - Dan Oron
- Department of Physics of
Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel
| |
Collapse
|
6
|
Zhu G, Bao C, Liu Y, Shen X, Xi C, Xu Z, Ji Z. Self-regulated route to ternary hybrid nanocrystals of Ag-Ag2S-CdS with near-infrared photoluminescence and enhanced photothermal conversion. NANOSCALE 2014; 6:11147-11156. [PMID: 25212685 DOI: 10.1039/c4nr03001j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Developing hybrid nanocrystals is a hot topic in materials science. Herein, a ternary hybrid nanocrystal, Ag-Ag2S-CdS, combining near infrared emission and photothermal conversion properties was demonstrated. The ternary Ag-Ag2S-CdS hybrid nanocrystals with cubic shape and uniform size were synthesized by a simple one-pot and one-step colloidal method. The growth process is self-regulated with the formation order of Ag2S, Ag, and CdS, sequentially. The formation of Ag originates from the partial reduction of Ag2S, while the formation of CdS is through an Ag2S catalytic mechanism based on its superionic feature. The obtained ternary hybrid nanocrystals show near infrared emission and photothermal conversion properties in a lab-on-a-particle system. Importantly, an enhanced effect is observed for the photothermal conversion, which is mainly due to the presence of heterointerfaces among the crystals. This work will not only advance the synthesis chemistry of multi-component hybrid nanocrystals but also provide a possible route for the design of advanced multi-model materials used in bio-related fields.
Collapse
Affiliation(s)
- Guoxing Zhu
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China.
| | | | | | | | | | | | | |
Collapse
|
7
|
Kim WD, Lee S, Pak C, Woo JY, Lee K, Baum F, Won J, Lee DC. Metal tips on pyramid-shaped PbSe/CdSe/CdS heterostructure nanocrystal photocatalysts: study of Ostwald ripening and core/shell formation. Chem Commun (Camb) 2014; 50:1719-21. [PMID: 24395043 DOI: 10.1039/c3cc48919a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We report ripening of metal particles anchored on pyramid-shaped heterostructure nanocrystals. The 'intra-particle' ripening results in a large metal tip at one corner with the other three tips vanishing. Investigation reveals that the ripening and core/shell formation affects photocatalytic activities via the Fermi level change.
Collapse
Affiliation(s)
- Whi Dong Kim
- Department of Chemical and Biomolecular Engineering, KAIST Institute for the Nanocentury, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea.
| | | | | | | | | | | | | | | |
Collapse
|
8
|
Volokh M, Diab M, Magen O, Jen-La Plante I, Flomin K, Rukenstein P, Tessler N, Mokari T. Coating and enhanced photocurrent of vertically aligned zinc oxide nanowire arrays with metal sulfide materials. ACS APPLIED MATERIALS & INTERFACES 2014; 6:13594-9. [PMID: 25133933 DOI: 10.1021/am502976v] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Hybrid nanostructures combining zinc oxide (ZnO) and a metal sulfide (MS) semiconductor are highly important for energy-related applications. Controlled filling and coating of vertically aligned ZnO nanowire arrays with different MS materials was achieved via the thermal decomposition approach of single-source precursors in the gas phase by using a simple atmospheric-pressure chemical vapor deposition system. Using different precursors allowed us to synthesize multicomponent structures such as nanowires coated with alloy shell or multishell structures. Herein, we present the synthesis and structural characterization of the different structures, as well as an electrochemical characterization and a photovoltaic response of the ZnO-CdS system, in which the resulting photocurrent upon illumination indicates charge separation at the interface.
Collapse
Affiliation(s)
- Michael Volokh
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev , Beer-Sheva 8410501, Israel
| | | | | | | | | | | | | | | |
Collapse
|
9
|
Flomin K, Jen-La Plante I, Moshofsky B, Diab M, Mokari T. Selective growth of metal particles on ZnO nanopyramids via a one-pot synthesis. NANOSCALE 2014; 6:1335-9. [PMID: 24362921 DOI: 10.1039/c3nr05661a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Hybrid nanostructures of metal (Cu, Au, Ag)-ZnO nanopyramids were synthesized. These hybrid nanostructures possess two distinct morphologies where the metal can be selectively attached to either the base or the tip of the ZnO pyramids. This is the first time that such morphologies are reported for Cu-ZnO and Ag-ZnO hybrid nanostructures.
Collapse
Affiliation(s)
- Kobi Flomin
- Department of Chemistry and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
| | | | | | | | | |
Collapse
|
10
|
Zhou J, Huang F, Xu J, Wang Y. Controllable synthesis of metal selenide heterostructures mediated by Ag2Se nanocrystals acting as catalysts. NANOSCALE 2013; 5:9714-9719. [PMID: 24056899 DOI: 10.1039/c3nr03601d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Ag2Se nanocrystals were demonstrated to be novel semiconductor mediators, or in other word catalysts, for the growth of semiconductor heterostructures in solution. This is a result of the unique feature of Ag2Se as a fast ion conductor, allowing foreign cations to dissolve and then to heterogrow the second phase. Using Ag2Se nanocrystals as catalysts, dimeric metal selenide heterostructures such as Ag2Se-CdSe and Ag2Se-ZnSe, and even multi-segment heterostructures such as Ag2Se-CdSe-ZnSe and Ag2Se-ZnSe-CdSe, were successfully synthesized. Several interesting features were found in the Ag2Se based heterogrowth. At the initial stage of heterogrowth, a layer of the second phase forms on the surface of an Ag2Se nanosphere, with a curved junction interface between the two phases. With further growth of the second phase, the Ag2Se nanosphere tends to flatten the junction surface by modifying its shape from sphere to hemisphere in order to minimize the conjunct area and thus the interfacial energy. Notably, the crystallographic relationship of the two phases in the heterostructure varies with the lattice parameters of the second phase, in order to reduce the lattice mismatch at the interface. Furthermore, a small lattice mismatch at the interface results in a straight rod-like second phase, while a large lattice mismatch would induce a tortuous product. The reported results may provide a new route for developing novel selenide semiconductor heterostructures which are potentially applicable in optoelectronic, biomedical, photovoltaic and catalytic fields.
Collapse
Affiliation(s)
- Jiangcong Zhou
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
| | | | | | | |
Collapse
|
11
|
Tenne R, Teitelboim A, Rukenstein P, Dyshel M, Mokari T, Oron D. Studying quantum dot blinking through the addition of an engineered inorganic hole trap. ACS NANO 2013; 7:5084-90. [PMID: 23668262 DOI: 10.1021/nn4017845] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
An all-inorganic compound colloidal quantum dot incorporating a highly emissive CdSe core, which is linked by a CdS tunneling barrier to an engineered charge carrier trap composed of PbS, is designed, and its optical properties are studied in detail at the single-particle level. Study of this structure enables a deeper understanding of the link between photoinduced charging and surface trapping of charge carriers and the phenomenon of quantum dot blinking. In the presence of the hole trap, a "gray" emissive state appears, associated with charging of the core. Rapid switching is observed between the "on" and the "gray" state, although the switching dynamics in and out of the dark "off" state remain unaffected. This result completes the links in the causality chain connecting charge carrier trapping, charging of QDs, and the appearance of a "gray" emission state.
Collapse
Affiliation(s)
- Ron Tenne
- Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel
| | | | | | | | | | | |
Collapse
|