02320nas a2200229   4500008004100000022001400041245016200055210006900217260000900286300001600295490000600311520149100317100001901808700002101827700002101848700001901869700002101888700001801909700001901927700002201946856012201968       2020                        eng d  a2050-748800aWavelength dependent luminescence decay kinetics in `quantum-confined' g-C(3)N(4)nanosheets exhibiting high photocatalytic efficiency upon plasmonic coupling0 aWavelength dependent luminescence decay kinetics in quantumconfi  cOCT   a20581-205920 v83 a<p>Serendipitous observations offer newer insights into materials properties. Here we describe g-C(3)N(4)nanosheets exhibiting remarkably blue-shifted photoluminescence within the 390-580 nm range centred at 425 nm which matches more closely with its `quantum-dots', and yet is excitation-wavelength independent. Moreover, surprisingly, the luminescence decay becomes increasingly slow at higher emission wavelengths, by up to 10 times. The nanosheets absorb only a fraction of visible-light. To improve this, when we designed a nanocomposite of g-C(3)N(4)and Au nanoparticles (NPs), it retained the PL characteristics and also exhibited excellent light-harvesting and photocatalytic efficiency for benzylamine (BA) oxidation. The surface plasmon resonance of the Au NPs is responsible for the high visible-light response and assisting the reaction by the `hot-electron' injection mechanism, while an uncharacteristic, pronounced co-catalytic effect by them further improves the efficiency. The conversion is 98% with &gt;99% selectivity over 1.5 h of natural sunlight and open-air, probably the highest efficiency for BA photo-oxidation reactions. Even though such a dual role by plasmonic NPs has remained unscrutinized, we argue that the charge-transfer processes for the `hot-carrier' injection and co-catalytic events are well-separated in time due to a much slower photon incident frequency on a catalyst particle, enabling both to occur simultaneously in the same particle.</p>
1 aMondal, Sanjit1 aSahoo, Lipipuspa1 aVaishnav, Yuvraj1 aMishra, Samita1 aRoy, Raj, Sekhar1 aVinod, C., P.1 aDe, Arijit, K.1 aGautam, Ujjal, K.  uhttps://library.ncl.res.in/content/wavelength-dependent-luminescence-decay-kinetics-quantum-confined-g-c3n4nanosheets