02361nas a2200265   4500008004100000022001400041245011400055210006900169260009900238300001200337490000600349520141000355653001901765653002301784653002001807653001201827653001801839100001501857700002201872700001401894700002201908700001901930700002201949856012401971       2015                        eng d  a1998-012400aSelf-assembled vertically aligned gold nanorod super-lattices for ultra-high sensitive detection of molecules0 aSelfassembled vertically aligned gold nanorod superlattices for   aTSINGHUA UNIV, RM A703, XUEYAN BLDG, BEIJING, 10084, PEOPLES R CHINAbTSINGHUA UNIV PRESScMAR  a907-9190 v83 a<p>We show that self-assembled vertically aligned gold nanorod (VA-GNRs) superlattices can serve as probes or substrates for ultra-high sensitive detection of various molecules. D-glucose and 2,4,6-trinitrotoluene (TNT) have been chosen as model systems due to their very low Raman cross-sections (5.6 x 10(-30) cm(2).molecule(-1).sr(-1) for D-glucose and 4.9 x 10(-31) cm(2). molecule(-1).sr(-1) for TNT) to show that the VA-GNR superlattice assembly offers as low as yoctomole sensitivity. Our experiment on mixed samples of bovine serum albumin (BSA) and D-glucose solutions demonstrate sensitivity for the latter, and the possible extension to real samples. Self-assembled superlattices of VA-GNRs were achieved on a silicon wafer by depositing a drop of solvent containing the GNRs and subsequent solvent evaporation in ambient conditions. An additional advantage of the VA-GNR monolayers is their extremely high reproducible morphology accompanied by ultrahigh sensitivity which will be useful in many fields where a very small amount of analyte is available. Moreover the assembly can be reused a number of times after removing the already present molecules. The method of obtaining VA-GNRs is simple, inexpensive and reproducible. With the help of simulations of monolayers and multilayers it has been shown that superlattices can achieve better sensitivity than monolayer assembly of VA-GNRs.</p>10aNanostructures10aRaman spectroscopy10aself-assemblies10asensors10asuperlattices1 aApte, Amey1 aBhaskar, Prashant1 aDas, Raja1 aChaturvedi, Smita1 aPoddar, Pankaj1 aKulkarni, Sulabha  uhttps://library.ncl.res.in/content/self-assembled-vertically-aligned-gold-nanorod-super-lattices-ultra-high-sensitive-001942nas a2200217   4500008004100000022001400041245016100055210006900216260000800285300001200293490000700305520114200312653001801454653002301472653003301495653001001528653001601538100002001554700001901574856013101593       2023                        eng d  a0377-048600aSystematic study of rare-earth ions size-dependent structural phase transition from monazite to zircon-type in rare earth chromates using Raman spectroscopy0 aSystematic study of rareearth ions sizedependent structural phas  cJUL  a793-8010 v543 a<p>
	Rare earth chromates (RCrO4) undergo monazite to zircon-type structural phase transition due to a decreased rare-earth ion size. They also exhibit an intermediate mixed phase. However, there is no systematic study on the influence of structural distortion on their phononic behavior, which is quite sensitive to subtle environmental variations. A change in the room temperature phononic spectrum was studied in the family of RCrO4 compounds, where R was varied from La to Yb using Raman modes. With an increase in the atomic number from Nd to Yb for zircon-type phases, the external translational and rotational modes were observed to shift towards lower and higher wavenumbers, respectively. At the same time, all internal vibrational modes shifted towards higher phonon energies. A comparison between Raman modes for monazite, intermediate, and zircon-type RCrO4 phases showed a gradual shift in the internal modes towards a higher wavenumber. The confirmation of the change in Raman modes with the decreasing radius was found by comparing the rare-earth elements in DyCrO4 and LaCrO4 with non-rare-earth elements in YCrO4.</p>
10amonazite-type10aRaman spectroscopy10arare earth chromates (RCrO4)10aYCrO410azircon type1 aUghade, Supriya1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/systematic-study-rare-earth-ions-size-dependent-structural-phase-transition-monazite-zircon