---
_id: '13368'
abstract:
- lang: eng
text: Scanning nanoscale superconducting quantum interference devices (nanoSQUIDs)
are of growing interest for highly sensitive quantitative imaging of magnetic,
spintronic, and transport properties of low-dimensional systems. Utilizing specifically
designed grooved quartz capillaries pulled into a sharp pipette, we have fabricated
the smallest SQUID-on-tip (SOT) devices with effective diameters down to 39 nm.
Integration of a resistive shunt in close proximity to the pipette apex combined
with self-aligned deposition of In and Sn, has resulted in SOTs with a flux noise
of 42 nΦ0 Hz−1/2, yielding a record low spin noise of 0.29 μB Hz−1/2. In addition,
the new SOTs function at sub-Kelvin temperatures and in high magnetic fields of
over 2.5 T. Integrating the SOTs into a scanning probe microscope allowed us to
image the stray field of a single Fe3O4 nanocube at 300 mK. Our results show that
the easy magnetization axis direction undergoes a transition from the 〈111〉 direction
at room temperature to an in-plane orientation, which could be attributed to the
Verwey phase transition in Fe3O4.
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Y.
full_name: Anahory, Y.
last_name: Anahory
- first_name: H. R.
full_name: Naren, H. R.
last_name: Naren
- first_name: E. O.
full_name: Lachman, E. O.
last_name: Lachman
- first_name: S.
full_name: Buhbut Sinai, S.
last_name: Buhbut Sinai
- first_name: A.
full_name: Uri, A.
last_name: Uri
- first_name: L.
full_name: Embon, L.
last_name: Embon
- first_name: E.
full_name: Yaakobi, E.
last_name: Yaakobi
- first_name: Y.
full_name: Myasoedov, Y.
last_name: Myasoedov
- first_name: M. E.
full_name: Huber, M. E.
last_name: Huber
- first_name: Rafal
full_name: Klajn, Rafal
id: 8e84690e-1e48-11ed-a02b-a1e6fb8bb53b
last_name: Klajn
- first_name: E.
full_name: Zeldov, E.
last_name: Zeldov
citation:
ama: Anahory Y, Naren HR, Lachman EO, et al. SQUID-on-tip with single-electron spin
sensitivity for high-field and ultra-low temperature nanomagnetic imaging. Nanoscale.
2020;12(5):3174-3182. doi:10.1039/c9nr08578e
apa: Anahory, Y., Naren, H. R., Lachman, E. O., Buhbut Sinai, S., Uri, A., Embon,
L., … Zeldov, E. (2020). SQUID-on-tip with single-electron spin sensitivity for
high-field and ultra-low temperature nanomagnetic imaging. Nanoscale. Royal
Society of Chemistry. https://doi.org/10.1039/c9nr08578e
chicago: Anahory, Y., H. R. Naren, E. O. Lachman, S. Buhbut Sinai, A. Uri, L. Embon,
E. Yaakobi, et al. “SQUID-on-Tip with Single-Electron Spin Sensitivity for High-Field
and Ultra-Low Temperature Nanomagnetic Imaging.” Nanoscale. Royal Society
of Chemistry, 2020. https://doi.org/10.1039/c9nr08578e.
ieee: Y. Anahory et al., “SQUID-on-tip with single-electron spin sensitivity
for high-field and ultra-low temperature nanomagnetic imaging,” Nanoscale,
vol. 12, no. 5. Royal Society of Chemistry, pp. 3174–3182, 2020.
ista: Anahory Y, Naren HR, Lachman EO, Buhbut Sinai S, Uri A, Embon L, Yaakobi E,
Myasoedov Y, Huber ME, Klajn R, Zeldov E. 2020. SQUID-on-tip with single-electron
spin sensitivity for high-field and ultra-low temperature nanomagnetic imaging.
Nanoscale. 12(5), 3174–3182.
mla: Anahory, Y., et al. “SQUID-on-Tip with Single-Electron Spin Sensitivity for
High-Field and Ultra-Low Temperature Nanomagnetic Imaging.” Nanoscale,
vol. 12, no. 5, Royal Society of Chemistry, 2020, pp. 3174–82, doi:10.1039/c9nr08578e.
short: Y. Anahory, H.R. Naren, E.O. Lachman, S. Buhbut Sinai, A. Uri, L. Embon,
E. Yaakobi, Y. Myasoedov, M.E. Huber, R. Klajn, E. Zeldov, Nanoscale 12 (2020)
3174–3182.
date_created: 2023-08-01T09:37:53Z
date_published: 2020-01-10T00:00:00Z
date_updated: 2023-08-07T10:32:15Z
day: '10'
doi: 10.1039/c9nr08578e
extern: '1'
external_id:
arxiv:
- '2001.03342'
pmid:
- '31967152'
intvolume: ' 12'
issue: '5'
keyword:
- General Materials Science
language:
- iso: eng
main_file_link:
- url: https://doi.org/10.48550/arXiv.2001.03342
month: '01'
oa_version: Preprint
page: 3174-3182
pmid: 1
publication: Nanoscale
publication_identifier:
eissn:
- 2040-3372
issn:
- 2040-3364
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: SQUID-on-tip with single-electron spin sensitivity for high-field and ultra-low
temperature nanomagnetic imaging
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 12
year: '2020'
...
---
_id: '13385'
abstract:
- lang: eng
text: Novel light-responsive nanoparticles were synthesized by decorating the surfaces
of gold and silver nanoparticles with a nitrospiropyran molecular photoswitch.
Upon exposure to UV light in nonpolar solvents, these nanoparticles self-assembled
to afford spherical aggregates, which disassembled rapidly when the UV stimulus
was turned off. The sizes of these aggregates depended on the nanoparticle concentration,
and their lifetimes could be controlled by adjusting the surface concentration
of nitrospiropyran on the nanoparticles. The conformational flexibility of nitrospiropyran,
which was altered by modifying the structure of the background ligand, had a profound
impact on the self-assembly process. By coating the nanoparticles with a spiropyran
lacking the nitro group, a conceptually different self-assembly system, relying
on a reversible proton transfer, was realized. The resulting particles spontaneously
(in the dark) assembled into aggregates that could be readily disassembled upon
exposure to blue light.
article_processing_charge: No
article_type: original
author:
- first_name: Pintu K.
full_name: Kundu, Pintu K.
last_name: Kundu
- first_name: Sanjib
full_name: Das, Sanjib
last_name: Das
- first_name: Johannes
full_name: Ahrens, Johannes
last_name: Ahrens
- first_name: Rafal
full_name: Klajn, Rafal
id: 8e84690e-1e48-11ed-a02b-a1e6fb8bb53b
last_name: Klajn
citation:
ama: Kundu PK, Das S, Ahrens J, Klajn R. Controlling the lifetimes of dynamic nanoparticle
aggregates by spiropyran functionalization. Nanoscale. 2016;8(46):19280-19286.
doi:10.1039/c6nr05959g
apa: Kundu, P. K., Das, S., Ahrens, J., & Klajn, R. (2016). Controlling the
lifetimes of dynamic nanoparticle aggregates by spiropyran functionalization.
Nanoscale. Royal Society of Chemistry. https://doi.org/10.1039/c6nr05959g
chicago: Kundu, Pintu K., Sanjib Das, Johannes Ahrens, and Rafal Klajn. “Controlling
the Lifetimes of Dynamic Nanoparticle Aggregates by Spiropyran Functionalization.”
Nanoscale. Royal Society of Chemistry, 2016. https://doi.org/10.1039/c6nr05959g.
ieee: P. K. Kundu, S. Das, J. Ahrens, and R. Klajn, “Controlling the lifetimes of
dynamic nanoparticle aggregates by spiropyran functionalization,” Nanoscale,
vol. 8, no. 46. Royal Society of Chemistry, pp. 19280–19286, 2016.
ista: Kundu PK, Das S, Ahrens J, Klajn R. 2016. Controlling the lifetimes of dynamic
nanoparticle aggregates by spiropyran functionalization. Nanoscale. 8(46), 19280–19286.
mla: Kundu, Pintu K., et al. “Controlling the Lifetimes of Dynamic Nanoparticle
Aggregates by Spiropyran Functionalization.” Nanoscale, vol. 8, no. 46,
Royal Society of Chemistry, 2016, pp. 19280–86, doi:10.1039/c6nr05959g.
short: P.K. Kundu, S. Das, J. Ahrens, R. Klajn, Nanoscale 8 (2016) 19280–19286.
date_created: 2023-08-01T09:42:22Z
date_published: 2016-10-19T00:00:00Z
date_updated: 2023-08-07T12:24:46Z
day: '19'
doi: 10.1039/c6nr05959g
extern: '1'
external_id:
pmid:
- '27830865'
intvolume: ' 8'
issue: '46'
keyword:
- General Materials Science
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://doi.org/10.1039/C6NR05959G
month: '10'
oa: 1
oa_version: Published Version
page: 19280-19286
pmid: 1
publication: Nanoscale
publication_identifier:
eissn:
- 2040-3372
issn:
- 2040-3364
publication_status: published
publisher: Royal Society of Chemistry
quality_controlled: '1'
scopus_import: '1'
status: public
title: Controlling the lifetimes of dynamic nanoparticle aggregates by spiropyran
functionalization
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 8
year: '2016'
...
---
_id: '7456'
abstract:
- lang: eng
text: The rational design of monodisperse ferroelectric nanocrystals with controlled
size and shape and their organization into hierarchical structures has been a
critical step for understanding the polar ordering in nanoscale ferroelectrics,
as well as the design of nanocrystal-based functional materials which harness
the properties of individual nanoparticles and the collective interactions between
them. We report here on the synthesis and self-assembly of aggregate-free, single-crystalline
titanium-based perovskite nanoparticles with controlled morphology and surface
composition by using a simple, easily scalable and highly versatile colloidal
route. Single-crystalline, non-aggregated BaTiO3 colloidal nanocrystals, used
as a model system, have been prepared under solvothermal conditions at temperatures
as low as 180 °C. The shape of the nanocrystals was tuned from spheroidal to cubic
upon changing the polarity of the solvent, whereas their size was varied from
16 to 30 nm for spheres and 5 to 78 nm for cubes by changing the concentration
of the precursors and the reaction time, respectively. The hydrophobic, oleic
acid-passivated nanoparticles exhibit very good solubility in non-polar solvents
and can be rendered dispersible in polar solvents by a simple process involving
the oxidative cleavage of the double bond upon treating the nanopowders with the
Lemieux–von Rudloff reagent. Lattice dynamic analysis indicated that regardless
of their size, BaTiO3 nanocrystals present local disorder within the perovskite
unit cell, associated with the existence of polar ordering. We also demonstrate
for the first time that, in addition to being used for fabricating large area,
crack-free, highly uniform films, BaTiO3 nanocubes can serve as building blocks
for the design of 2D and 3D mesoscale structures, such as superlattices and superparticles.
Interestingly, the type of superlattice structure (simple cubic or face centered
cubic) appears to be determined by the type of solvent in which the nanocrystals
were dispersed. This approach provides an excellent platform for the synthesis
of other titanium-based perovskite colloidal nanocrystals with controlled chemical
composition, surface structure and morphology and for their assembly into complex
architectures, therefore opening the door for the design of novel mesoscale functional
materials/nanocomposites with potential applications in energy conversion, data
storage and the biomedical field.
article_processing_charge: No
article_type: original
author:
- first_name: Daniela
full_name: Caruntu, Daniela
last_name: Caruntu
- first_name: Taha
full_name: Rostamzadeh, Taha
last_name: Rostamzadeh
- first_name: Tommaso
full_name: Costanzo, Tommaso
id: D93824F4-D9BA-11E9-BB12-F207E6697425
last_name: Costanzo
orcid: 0000-0001-9732-3815
- first_name: Saman
full_name: Salemizadeh Parizi, Saman
last_name: Salemizadeh Parizi
- first_name: Gabriel
full_name: Caruntu, Gabriel
last_name: Caruntu
citation:
ama: Caruntu D, Rostamzadeh T, Costanzo T, Salemizadeh Parizi S, Caruntu G. Solvothermal
synthesis and controlled self-assembly of monodisperse titanium-based perovskite
colloidal nanocrystals. Nanoscale. 2015;7(30):12955-12969. doi:10.1039/c5nr00737b
apa: Caruntu, D., Rostamzadeh, T., Costanzo, T., Salemizadeh Parizi, S., & Caruntu,
G. (2015). Solvothermal synthesis and controlled self-assembly of monodisperse
titanium-based perovskite colloidal nanocrystals. Nanoscale. RSC. https://doi.org/10.1039/c5nr00737b
chicago: Caruntu, Daniela, Taha Rostamzadeh, Tommaso Costanzo, Saman Salemizadeh
Parizi, and Gabriel Caruntu. “Solvothermal Synthesis and Controlled Self-Assembly
of Monodisperse Titanium-Based Perovskite Colloidal Nanocrystals.” Nanoscale.
RSC, 2015. https://doi.org/10.1039/c5nr00737b.
ieee: D. Caruntu, T. Rostamzadeh, T. Costanzo, S. Salemizadeh Parizi, and G. Caruntu,
“Solvothermal synthesis and controlled self-assembly of monodisperse titanium-based
perovskite colloidal nanocrystals,” Nanoscale, vol. 7, no. 30. RSC, pp.
12955–12969, 2015.
ista: Caruntu D, Rostamzadeh T, Costanzo T, Salemizadeh Parizi S, Caruntu G. 2015.
Solvothermal synthesis and controlled self-assembly of monodisperse titanium-based
perovskite colloidal nanocrystals. Nanoscale. 7(30), 12955–12969.
mla: Caruntu, Daniela, et al. “Solvothermal Synthesis and Controlled Self-Assembly
of Monodisperse Titanium-Based Perovskite Colloidal Nanocrystals.” Nanoscale,
vol. 7, no. 30, RSC, 2015, pp. 12955–69, doi:10.1039/c5nr00737b.
short: D. Caruntu, T. Rostamzadeh, T. Costanzo, S. Salemizadeh Parizi, G. Caruntu,
Nanoscale 7 (2015) 12955–12969.
date_created: 2020-02-05T14:16:37Z
date_published: 2015-08-14T00:00:00Z
date_updated: 2023-02-23T13:08:24Z
day: '14'
doi: 10.1039/c5nr00737b
extern: '1'
external_id:
pmid:
- '26168304'
intvolume: ' 7'
issue: '30'
language:
- iso: eng
month: '08'
oa_version: None
page: 12955-12969
pmid: 1
publication: Nanoscale
publication_identifier:
issn:
- 2040-3364
- 2040-3372
publication_status: published
publisher: RSC
quality_controlled: '1'
status: public
title: Solvothermal synthesis and controlled self-assembly of monodisperse titanium-based
perovskite colloidal nanocrystals
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 7
year: '2015'
...