254
14 Creating Genetic Materials of Metal Clusters
Fig. 14.9 A schematic illustration explaining the soft landing of mass-selected gold clusters onto
surfaces. The clusters are introduced into the gas phase from solution using electrospray ionization,
filtered according to mass-to-charge ratio using a quadrupole mass filter, and delivered to different
SAM surfaces at controlled energies: a FSAM, b COOH-SAM, c HSAM. High-mass range of the
positive mode in situ TOF-SIMS mass spectrum (m/z = 800–5000) of the SAM surfaces after soft
landing of 5 × 10 11 Au 11 L 5
3+ (L = DPPP) (m/z = 1409.5) clusters for all. d a sketch showing
the soft-landing process; e the relationship of the ICR-SIMS abundance with deposition time,
representatively for FSAM. Reproduced with permission from Ref. [177]. Copyright 2011 American
Chemical Society
As illustrated above, the interesting process of soft-landing has been widely
utilized for the deposition of small molecules [192, 247–250], peptides [244, 246,
251, 252], and proteins [251–253], oligonucleotides [254] and viruses [255], and
clusters [17, 18, 256–259], onto various substrates for surface chemistry, photochemistry and catalysis investigations. Besides the morphology characterization, these
soft-landing modified surfaces were subsequently applied to several aspects, such as
surface-enhanced Raman spectroscopy [248], deposition of low-energy ions on liquid
surfaces was used to investigate transport properties of small ions through thin/thick
films [260, 261]. Gas-phase ion chemistry combined with soft-landing provides
a unique opportunity for preparation of novel synthetic materials, such as chiralenriched products demonstrated by Cooks and coworkers [262], through soft-landing
of protonated serine octamers. The soft-landing technique is particularly beneficial to cluster assembly as a tool for selective isolation of metal clusters especially
those cannot be synthesized in condensed phase such as the Metallo-Carbohedrenes
(Met-Cars) as mentioned in Chap. 10 [210].
14 Creating Genetic Materials of Metal Clusters
Fig. 14.9 A schematic illustration explaining the soft landing of mass-selected gold clusters onto
surfaces. The clusters are introduced into the gas phase from solution using electrospray ionization,
filtered according to mass-to-charge ratio using a quadrupole mass filter, and delivered to different
SAM surfaces at controlled energies: a FSAM, b COOH-SAM, c HSAM. High-mass range of the
positive mode in situ TOF-SIMS mass spectrum (m/z = 800–5000) of the SAM surfaces after soft
landing of 5 × 10 11 Au 11 L 5
3+ (L = DPPP) (m/z = 1409.5) clusters for all. d a sketch showing
the soft-landing process; e the relationship of the ICR-SIMS abundance with deposition time,
representatively for FSAM. Reproduced with permission from Ref. [177]. Copyright 2011 American
Chemical Society
As illustrated above, the interesting process of soft-landing has been widely
utilized for the deposition of small molecules [192, 247–250], peptides [244, 246,
251, 252], and proteins [251–253], oligonucleotides [254] and viruses [255], and
clusters [17, 18, 256–259], onto various substrates for surface chemistry, photochemistry and catalysis investigations. Besides the morphology characterization, these
soft-landing modified surfaces were subsequently applied to several aspects, such as
surface-enhanced Raman spectroscopy [248], deposition of low-energy ions on liquid
surfaces was used to investigate transport properties of small ions through thin/thick
films [260, 261]. Gas-phase ion chemistry combined with soft-landing provides
a unique opportunity for preparation of novel synthetic materials, such as chiralenriched products demonstrated by Cooks and coworkers [262], through soft-landing
of protonated serine octamers. The soft-landing technique is particularly beneficial to cluster assembly as a tool for selective isolation of metal clusters especially
those cannot be synthesized in condensed phase such as the Metallo-Carbohedrenes
(Met-Cars) as mentioned in Chap. 10 [210].