Tuning and controlling the plasmon
coupling of noble metal nanoparticles
are significant for enhancing their near-field and far-field responses.
In this work, a novel heterogeneous plasmonic assembly with a controllable
hot spot model was proposed by the conjugation of Au nanospheres (NSs)
and Au@Ag core–shell nanocube (NC) films. Three hotspot configurations
including point-to-point type, point-to-facet type, and facet-to-facet
type were fabricated and transformed simply by adjusting the doping
ratio of nanoparticles in the co-assembly film. Expectedly, the localized
surface plasmon resonance (LSPR) property and surface-enhanced Raman
scattering (SERS) performance of the binary assembly film exhibit
distinct diversity due to the change in the hotspot conformation.
Interestingly, the point-to-facet hotspot in hybrid assembly films
can provide the most extraordinary enhancement for SERS behavior compared
with single-component Au NS and Au@Ag NC plasmonic assemblies, which
is further confirmed by the finite-different time-domain simulation
results of dimer nanostructures. In addition, the two-dimensional
binary assemblies of Au NS doping in Au@Ag NCs with excellent sensitivity
and high reproducibility were successfully applied in the identification
of ketamine. This work opens a new avenue toward the fabrication of
plasmonic metal materials with collective LSPR properties and sensitive
SERS behavior.
A Gram-stain-positive, non-motile and short rod-shaped actinobacterium, designated strain LNNU 22110T, was isolated from the rhizosphere soil of the halophyte Suaeda aralocaspica (Bunge) Freitag and Schütze, which collected in Xinjiang, north-west China. Growth occurred at 10–45 °C, pH 6.0–10.0 and in the presence of 0–11 % NaCl (w/v). Based on the results of 16S rRNA gene sequence phylogenetic analyses, strain LNNU 22110T belonged to the genus
Ruania
and had 97.5 and 95.5 % sequence similarity to
Ruania alba
KCTC 19413T and
Ruania albidiflava
CGMCC 4.3142T, respectively. The digital DNA–DNA hybridization relatedness values between strain LNNU 22110T and
R. alba
KCTC 19413T and
R. albidiflava
CGMCC 4.3142T were 23.2 and 19.9 %, respectively. The highest average nucleotide identity value between strain LNNU 22110T and its closest related strain (
R. alba
KCTC 19413T) was 80.2 %, much lower than the species delineation threshold of 95–96 %. The genome of strain LNNU 22110T was 4.4 Mb, with a genomic DNA G+C content of 68.4 mol%. The diagnostic diamino acids in the peptidoglycan layer of strain LNNU 22110T were lysine, alanine, glycine, glutamic acid and aspartic acid. The predominant menaquinone was MK-8(H4). The major fatty acid (>10 %) was anteiso-C15 : 0. The polar lipid profile of strain LNNU 22110T included diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, diacylated phosphatidyl dimannoside, one unidentified glycolipid and two unidentified phospholipids. According to the phenotypic, phylogenetic and chemotaxonomic results, strain LNNU 22110T is considered to represent a novel species of the genus
Ruania
, for which the name Ruania rhizosphaerae sp. nov. is proposed. The type strain is LNNU 22110T (=KCTC 39807T=CGMCC 1.17105T).
Flat and dense monolayer Au@Ag nanorods/UCNPs (50–400 nm) is fabricated by an alternating self-assembly method. The optimized photoresponsivity and detectivity of Au@Ag NRs/UCNPs (150 nm)/MAPbI3 PDs is separately 0.51 A W−1 and 6.9 × 109 Jones.
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