01612nas a2200217   4500008004100000022001400041245006000055210005900115260007100174300001400245490000600259520089400265653002201159653002201181653002301203653001901226653000801245100002301253700002401276856009401300       2014                        eng d  a1944-824400aTemperature Dependent Phonon Shifts in Single-Layer WS20 aTemperature Dependent Phonon Shifts in SingleLayer WS2  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcJAN  a1158-11630 v63 a<p>Atomically thin two-dimensional tungsten disulfide (WS2) sheets have attracted much attention due to their potential for future nanoelectronic device applications. We report first experimental investigation on temperature dependent Raman spectra of single-layer WS2 prepared using micromechanical exfoliation. Our temperature dependent Raman spectroscopy results shows that the E-2g(1) and A(1g) modes of single-layer WS2 soften as temperature increases from 77 to 623 K. The calculated temperature coefficients of the frequencies of 2LA(M), E-2g(1), A(1g), and A(1g)(M) + LA(M) modes of single-layer WS2 were observed to be -0.008, -0.006, -0.006, and -0.01 cm(-1) K-1, respectively. The results were explained in terms of a double resonance process which is active in atomically thin nanosheet. This process can also be largely applicable in other emerging single-layer materials.</p>10alayered materials10aphonon vibrations10aRaman spectroscopy10athermal effect10aWS21 aThripuranthaka, M.1 aLate, Dattatray, J.  uhttps://library.ncl.res.in/content/temperature-dependent-phonon-shifts-single-layer-ws2-001832nas a2200205   4500008004100000022001400041245007000055210006900125260007100194300001400265490000600279520110600285653002101391653002201412653002201434653002301456653001901479100002401498856010401522       2015                        eng d  a1944-824400aTemperature dependent phonon shifts in few-layer black phosphorus0 aTemperature dependent phonon shifts in fewlayer black phosphorus  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcMAR  a5857-58620 v73 a<p>Atomically thin two-dimensional (2D) sheets of black phosphorus have attracted much attention due to their potential for future nanoelectronic and photonics device applications. Present investigations deal with the temperature dependent phonon shifts in a few-layer black phosphorus nanosheet sample prepared using micromechanical exfoliation on a 300 nm SiO2/Si substrate. The temperature dependent Raman spectroscopy experiments were carried out on a few-layer black phosphorus sample, which depicts softening of Ag-1 B-2g, and A(g)(2) modes as temperature increases from 77 to 673 K. The calculated temperature coefficients for Ag-1, B-2g, and A(g)(2) modes of the few-layer black phosphorus nanosheet sample were observed to be -0.01, -0.013, and -0.014 cm(-1) K-1, respectively. The temperature dependent softening modes of black phosphorus results were explained on the basis of a double resonance process which is more active in an atomically thin sample. This process can also be fundamentally pertinent in other promising and emerging 2D ultrathin layer and heterostructured materials.</p>10ablack phosphorus10alayered materials10aphonon vibrations10aRaman spectroscopy10athermal effect1 aLate, Dattatray, J.  uhttps://library.ncl.res.in/content/temperature-dependent-phonon-shifts-few-layer-black-phosphorus-0