Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Jaakko Koivisto"'
Autor:
Jaakko Koivisto, Tanja Lahtinen, Hannu Häkkinen, Gerrit Groenhof, Serena Donnini, Xi Chen, Mika Pettersson
Publikováno v:
Journal of Physical Chemistry C. 120(18):10041-10050
The pKa of the p-mercaptobenzoic acid (pMBA) ligands in the Au102(pMBA)44 nanocluster was measured by using acid–base and IR titration. The observed macroscopic pKa = 6.18 ± 0.05 is significantly more basic than that of free pMBA (pKa = 4.16), and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3a0ed3273a15079fe9c8f39d10397334
https://doi.org/10.1021/acs.jpcc.6b00922
https://doi.org/10.1021/acs.jpcc.6b00922
Autor:
Maia Azubel, Sami Malola, Hironori Tsunoyama, Tatsuya Tsukuda, Hannu Häkkinen, David A. Bushnell, Ai Leen Koh, Jaakko Koivisto, Roger D. Kornberg, Greg L. Hura, Mika Pettersson
Publikováno v:
Science. 345:909-912
Detailed structure of a gold nanoparticle Adding only a few atoms or changing the capping ligand can dramatically change the structure of individual metal nanoparticles. Azubel et al. used aberration-corrected transmission electron microscopy to deri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c3e7ab61eb6e294b71870719adccd2b
https://doi.org/10.1126/science.1251959
https://doi.org/10.1126/science.1251959
Autor:
Hannu Häkkinen, Jaakko Koivisto, Mika Pettersson, Sami Malola, Tanja Lahtinen, Mari Martikainen, Varpu Marjomäki, Kirsi Salorinne
Publikováno v:
Proceedings of the National Academy of Sciences. 111:1277-1281
Development of precise protocols for accurate site-specific conjugation of monodisperse inorganic nanoparticles to biological material is one of the challenges in contemporary bionanoscience and nanomedicine. We report here a successful site-specific
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0f8ce72e104822be26cb8bbb2ab01696
https://doi.org/10.1073/pnas.1310973111
https://doi.org/10.1073/pnas.1310973111
Autor:
Mika Pettersson, Hannu Häkkinen, Tanja Lahtinen, Sami Malola, Kirsi Salorinne, Satu Mustalahti, Jaakko Koivisto
Publikováno v:
The Journal of Physical Chemistry Letters. 5(2):387-392
We have determined vibrational signatures and optical gap of the Au144(PET)60 (PET: phenylethylthiol, SC2H4Ph) nanocluster solvated in deuterated dichloromethane (DCM-D2, CD2Cl2) and in a single crystal. For crystals, solid-state (13)C NMR and X-ray
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cb39c13fec60d311e98c705994c2cd14
http://juuli.fi/Record/0030952714
http://juuli.fi/Record/0030952714
Publikováno v:
Nanoscale. 6:7823-7826
The hydrodynamic diameter of Aum(pMBA)n [(m, n) = (102, 44) and (144, 60)] clusters in aqueous media was determined via DOSY NMR spectroscopy. The apparent size of the same (n, m) cluster depends on the counter ion of the deprotonated pMBA− ligand
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5375dfadfeefa0fa12475e168202b50f
https://doi.org/10.1039/c4nr01255k
https://doi.org/10.1039/c4nr01255k
Autor:
Hannu Häkkinen, Satu Mustalahti, Tanja Lahtinen, Jaakko Koivisto, Pasi Myllyperkiö, Sami Malola, Kirsi Salorinne, Mika Pettersson
Publikováno v:
The Journal of Physical Chemistry C. 118(31):18233-18239
Energy relaxation dynamics of a gold nanocluster with atomically precise composition, Au144(SC2H4Ph)60, is studied by transient mid-IR spectroscopy. The experiment is designed to simultaneously pro...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9197062211140be399869ca6062d77a5
http://juuli.fi/Record/0030950314
http://juuli.fi/Record/0030950314
Autor:
Elina Kalenius, Tanja Lahtinen, Hannu Häkkinen, Maija Nissinen, Kirsi Salorinne, Jaakko Koivisto, Mika Pettersson
Publikováno v:
Analytical Chemistry. 85(7):3489-3492
Diffusion ordered NMR spectroscopy (DOSY) was used as an analytical tool to estimate the size of thiol-stabilized gold nanoclusters in solution, namely, phenylethanethiol (PET) stabilized Au25(PET)18, Au38(PET)24, and Au144(PET)60. This was achieved
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::30a4c0cc4696052316fe1d3f1ea85163
https://doi.org/10.1021/ac303665b
https://doi.org/10.1021/ac303665b
Publikováno v:
The Journal of Physical Chemistry Letters. 3:3076-3080
Au144PET60 and Au144-xAgxPET60 (PET = SC2H4Ph, phenylethylthiolate, and 30 ≤ x ≤ 53) clusters were studied by optical spectroscopy and linear response time-dependent density functional theory. Spectra of thin dry films were measured in order to r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45bb0b379d44a840131e470b08e302f7
https://doi.org/10.1021/jz301261x
https://doi.org/10.1021/jz301261x
Autor:
Mika Pettersson, Hannu Häkkinen, Olga Lopez-Acevedo, Roger D. Kornberg, Yael Levi-Kalisman, Eero Hulkko, Jaakko Koivisto
Publikováno v:
Journal of the American Chemical Society. 133(11):3752-3755
Optical absorption of a gold nanocluster of 102 Au atoms protected by 44 para-mercaptobenzoic acid (p-MBA) ligands is measured in the range of 0.05-6.2 eV (mid-IR to UV) by a combination of several techniques for purified samples in solid and solutio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dadae693f69e95e8e08b3e657b325ec0
https://doi.org/10.1021/ja111077e
https://doi.org/10.1021/ja111077e
Autor:
Jaakko Koivisto, Hannu Häkkinen, Kirsi Salorinne, Pasi Myllyperkiö, Sami Malola, Satu Mustalahti, Mika Pettersson, Tanja Lahtinen
Publikováno v:
ACS nano. 9(3)
Photophysical properties of a water-soluble cluster Au102(pMBA)44 (pMBA = para-mercaptobenzoic acid) are studied by ultrafast time-resolved mid-IR spectroscopy and density functional theory calculations in order to distinguish between molecular and m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3e33fd73da42961ba8ec7553e36d34ec
https://pubmed.ncbi.nlm.nih.gov/25703546
https://pubmed.ncbi.nlm.nih.gov/25703546