01652nas a2200157 4500008004100000022001400041245021800055210006900273260000900342300001400351490000700365520093800372100002901310700003101339856012401370 2017 eng d a1466-803300aSelective synthesis of WO3 and W18O49 nanostructures: ligand-free pH-dependent morphology-controlled self-assembly of hierarchical architectures from 1D nanostructure and sunlight-driven photocatalytic degradation0 aSelective synthesis of WO3 and W18O49 nanostructures ligandfree  cAPR  a2096-21050 v193 a

In this study, simple inorganic routes for the synthesis of WO3 and W18O49 nanostructures with variable size and self-assembly are reported. The morphologies and formation of stoichiometric WO3 as well as substoichiometric W18O49 single-crystal phase could be controlled by changing the pH of the reactions medium. This synthesis strategy has the advantages that it is one step, aqueous medium-based, and requires no surfactant or stabilizing agent. Furthermore, it also enables the self-assembly of 1D nanorods of WO3 and W18O49 into hierarchical nanostructures as nanorods bundles, cocoons, urchins, fishbones, etc. This synthesis method may open up a new way to control and tune the stoichiometric and substoichiometric composition of metal oxide nanostructures. Efficient sunlight-driven photocatalytic performance to degrade Rhodamine B (100 mL; 40 mg L-1.) with these tungsten oxide nanostructures was also demonstrated.

1 aShirke, Yogita, Manikrao1 aMukherjee, Shatabdi, Porel uhttp://library.ncl.res.in/content/selective-synthesis-wo3-and-w18o49-nanostructures-ligand-free-ph-dependent-morphology02309nas a2200253 4500008004100000022001400041245013000055210006900185260000900254300001400263490000600277520143200283653001901715653001601734653001601750653002401766653001701790100002901807700001801836700001701854700002501871700003101896856012801927 2019 eng d a2365-654900aSize-controlled cobalt ferrite nanocrystals: magnetically separable reusable nanocatalysts for selective oxidation of styrene0 aSizecontrolled cobalt ferrite nanocrystals magnetically separabl cJUN  a6524-65310 v43 a

Superparamagnetic cobalt ferrite (CFO) nanocrystals (NCs) with sizes similar to 6 nm and similar to 4 nm were synthesized using a facile solvothermal method using fatty acids, lauric acid and stearic acid, as the capping agents. The synthesized nanocrystals were well characterized by XRD, FT-IR, XPS, SEM and TEM. The formation mechanism was explored and it was shown that the fatty acid was actually chemisorbed as a carboxylate onto the surface of CFO NCs. The experimental results specify that the size and size distribution of the CFO NCs were highly dependent on the length of fatty acid hydrophobic chain. Corresponding changes of the magnetic properties were investigated by measuring magnetization as a function of field and temperature, which suggest that the CFO NCs were superparamagnetic in nature. The catalytic properties for the oxidation of styrene in organic medium were examined by using the synthesized CFO NCs with sizes similar to 6 nm and similar to 4 nm. The synthesized CFO NCs, well dispersible in organic media, were demonstrated to be highly catalytically active, reached 100% conversion of styrene in 12 h with similar to 77% and similar to 82% selectivity for styrene oxide respectively. The magnetic CFO nanocatalysts were easily separated and recovered from the reaction medium by an external magnet, and reused for several cycles without losing catalytic selectivity for styrene oxide.

10aCobalt ferrite10aepoxidation10aFatty acids10amagnetic properties10ananocrystals1 aJeyavani, Vijayakrishnan1 aPawar, Sayali1 aDadwal, Arun1 aJoy, Pattayil, Alias1 aMukherjee, Shatabdi, Porel uhttp://library.ncl.res.in/content/size-controlled-cobalt-ferrite-nanocrystals-magnetically-separable-reusable-nanocatalysts01813nas a2200169 4500008004100000022001400041245015400055210006900209260000900278300001600287490000800303520112500311100002701436700003001463700003101493856011901524 2020 eng d a1932-744700aPhase- and morphology-controlled synthesis of tunable plasmonic MoO3-x nanomaterials for ultrasensitive surface-enhanced raman spectroscopy detection0 aPhase and morphologycontrolled synthesis of tunable plasmonic Mo cSEP  a21082-210930 v1243 a

The enhancement of the surface-enhanced Raman scattering (SERS) property of the plasmonic metal oxide semiconductor nanostructures by controlling their phase, shape, size, and oxygen vacancy to detect trace amounts of organics is of significant interest. In this study, a simple surfactant-free hydrothermal strategy was proposed to fabricate crystalline h-MoO3-x and alpha-MoO3-x nanomaterials with tunable plasmonic properties. Herein, the crystal phase, morphology, and oxygen vacancy of MoO3-x nanostructures were precisely controlled under suitable synthetic conditions. The plasmonic properties of the as-synthesized h-MoO3-x and alpha-MoO3-x micro-/nanostructures were controlled by adjusting the residual volume in the autoclaving chamber. In addition, the plasmonic MoO3-x exhibited SERS activity with a detection limit as low as 1.0 x 10(-9) M and the maximum enhancement factor (EF) up to 6.99 x 10(5) for h-MoO3-x, while for alpha-MoO3-x, the detection limit was 1.0 x 10(-7) M with the corresponding EF up to 8.51 x 10(3), comparable with plasmonic noble metal nanomaterials without a ``hot spot''.

1 aPatil, Manoj, Krishnat1 aGaikwad, Supriya, Hanmant1 aMukherjee, Shatabdi, Porel uhttp://library.ncl.res.in/content/phase-and-morphology-controlled-synthesis-tunable-plasmonic-moo3-x-nanomaterials01758nas a2200145 4500008004100000245012900041210006900170260000800239300001800247490000600265520123700271100003001508700003101538856004301569 2021 eng d00a2D MoO2/N-Doped-carbon nanosheets as SERS tweezers: a non-noble metal reusable substrate for selective organic dye detection0 a2D MoO2NDopedcarbon nanosheets as SERS tweezers a nonnoble metal cNOV a11611 - 116240 v43 aThe design and synthesis of a highly sensitive and exceptionally selective surface-enhanced Raman scattering (SERS) substrate with an excellent reusable property are of significant interest because of its vast prospective application in actual and complicated detection environments. Here, a simple synthesis strategy was presented to fabricate crystalline two-dimensional (2D) MoO2/N-doped-carbon nanosheets with the plasmonic property. The morphology, crystal phase, and surface property of MoO2 nanomaterials (NMs) were specifically controlled under suitable reaction conditions. In addition, the plasmonic MoO2/N-doped-carbon NM exhibited a SERS maximum enhancement factor up to 1.38 × 104 with a detection limit as low as 1.0 × 10–6 M. More importantly, the as-synthesized nanocomposite shows high selectivity as a “SERS Tweezer” toward methylene blue (MB) in binary and ternary mixed interfering analyte solutions, preserving detection sensitivity toward MB for three cycles via an “elect-and-eliminate” approach. This strategy will be helpful to design other plasmonic semiconductor NMs for successful tangible applications of selective SERS sensing for trace impurity detections in real and complex environments.1 aGaikwad, Supriya, Hanmant1 aMukherjee, Shatabdi, Porel uhttps://doi.org/10.1021/acsanm.1c0215101185nas a2200157 4500008004100000022001400041245011300055210006900168260000800237300001400245490000600259520059500265100001700860700003100877856011900908 2021 eng d a2050-748800aCsPbBr3/Cs4PbBr6 perovskite@COF nanocomposites for visible-light-driven photocatalytic applications in water0 aCsPbBr3Cs4PbBr6 perovskiteCOF nanocomposites for visiblelightdri cMAR a6819-68260 v93 a

For the first time, we have synthesized all-inorganic CsPbBr3/Cs4PbBr6 perovskite@COF nanocomposites under atmospheric conditions and tuned the crystal structures of the perovskite as well. The nanocomposite is reasonably stable and maintains its crystalline properties even when dipped into water for 60 minutes. The perovskite@COF nanocomposite shows efficient visible-light-driven photocatalytic performance to degrade Methyl orange (10 mL; 20-100 ppm). The rate of photodegradation was about 0.245 min(-1) with high catalytic activity and recyclability for three to six cycles.

1 aKour, Prachi1 aMukherjee, Shatabdi, Porel uhttp://library.ncl.res.in/content/cspbbr3cs4pbbr6-perovskitecof-nanocomposites-visible-light-driven-photocatalytic02139nas a2200313 4500008004100000022001400041245013500055210006900190260000900259300001600268490000700284520108400291653001901375653004001394653002201434653001901456653001601475100001701491700002501508700001401533700001801547700001601565700002001581700003101601700002301632700002301655700002501678856012201703 2021 eng d a1433-785100aOrganic-inorganic perovskitoid with zwitterion cysteamine linker and its crystal-crystal transformation to ruddlesden-popper phase0 aOrganicinorganic perovskitoid with zwitterion cysteamine linker  cAUG  a18750-187600 v603 aWe demonstrate synthesis of a new low-D hybrid perovskitoid (a perovskite-like hybrid halide structure, yellow crystals, P21/n space group) using zwitterion cysteamine (2-aminoethanethiol) linker, and its remarkable molecular diffusion-controlled crystal-to-crystal transformation to Ruddlesden-Popper phase (Red crystals, Pnma space group). Our stable intermediate perovskitoid distinctly differs from all previous reports by way of a unique staggered arrangement of holes in the puckered 2D configuration with a face-sharing connection between the corrugated-1D double chains. The PL intensity for the yellow phase is 5 orders higher as compared to the red phase and the corresponding average lifetime is also fairly long (143 ns). First principles DFT calculations conform very well with the experimental band gap data. We demonstrate applicability of the new perovskitoid yellow phase as an excellent active layer in a self-powered photodetector and for selective detection of Ni2+ via On-Off-On photoluminescence (PL) based on its composite with few-layer black phosphorous.10aCrystal growth10aorganic-inorganic hybrid composites10aperovskite phases10aphotodetectors10azwitterions1 aKour, Prachi1 aReddy, Mallu, Chenna1 aPal, Shiv1 aSidhik, Siraj1 aDas, Tisita1 aPandey, Padmini1 aMukherjee, Shatabdi, Porel1 aChakraborty, Sudip1 aMohite, Aditya, D.1 aOgale, Satishchandra uhttp://library.ncl.res.in/content/organic-inorganic-perovskitoid-zwitterion-cysteamine-linker-and-its-crystal-crystal01982nas a2200241 4500008004100000022001400041245012100055210006900176260000900245300000800254490000700262520111400269653001301383653002301396653002801419653003001447653002701477100002901504700002001533700002501553700003101578856013101609 2022 eng d a0250-470700aMgB2/NaNO2-PVA free-standing polymer composite film as a green firework: a step towards environmental sustainability0 aMgB2NaNO2PVA freestanding polymer composite film as a green fire cSEP  a1750 v453 a

We have demonstrated a simple fabrication methodology of free-standing polymer composite film firework that sparkles, provides colour display and moderate sound, yet is less polluting. The polymer composite film fireworks are composed of magnesium boride (MgB2), sodium nitrite (NaNO2) and poly(vinyl alcohol) (PVA). This study also suggested that a flammable, explosive powder composition can be made of two very common inorganic precursors, mainly NaNO2 and MgB2 . This is the first report demonstrating composite film fireworks with new flammable composition using metal boride as a primary precursor, which can also be used in conventional fireworks fabrication, replacing the traditional fuel, mainly gunpowder. The film fireworks were free from charcoal, sulphur, metal powder and paper. Therefore, they substantially lower the odour and COx, NOx, emissions and minimize the substantial trash generated when burned. Most importantly, film firework's minimum ignition temperature and exothermic decomposition temperature are much higher than the ambient temperature; hence are safe to handle.

10aFirework10afree-standing film10amagnesium boride (MgB2)10apoly(vinyl alcohol) (PVA)10asodium nitrite (NaNO2)1 aJeyavani, Vijayakrishnan1 aKumar, Rajendra1 aJoy, Pattayil, Alias1 aMukherjee, Shatabdi, Porel uhttp://library.ncl.res.in/content/mgb2nano2-pva-free-standing-polymer-composite-film-green-firework-step-towards-environmental02350nas a2200229 4500008004100000022001400041245011400055210006900169260000800238490000700246520155000253653001601803653000801819653002001827653002301847100001801870700002701888700003101915700003001946700001901976856012501995 2022 eng d a1861-472800aScalable mechanochemical synthesis of beta-ketoenamine-linked covalent organic frameworks for methane storage0 aScalable mechanochemical synthesis of betaketoenaminelinked cova cDEC0 v173 a

In the current scenario of increased pollution and releasing toxic gases by burning petroleum products, switching to natural gas is more promising for reducing CO2 emissions and air pollutants. Hence, research on Liquefied Natural Gas and Compressed Natural Gas is gaining more value. However, natural gas primarily consists of CH4, which has less energy density than conventional fuels. Interestingly, since the C-H ratio of CH4 gas is 1 : 4, it is easily combustible, gives less carbon footprint, and reduces unburnt hydrocarbon pollution. Hence, research on storing and transporting CH4 has utmost importance, and porous materials are one of the suitable candidates for storing CH4. Herein we report the scalable synthesis of highly porous and crystalline covalent organic frameworks for storing CH4 at room temperature and pressure. Two COFs, namely, Tp-Azo and Tp-Azo-BD(Me)(2), synthesized in 1 kg at similar to 45 g batch scale using a Planetary mixer, displayed a maximum BET surface area of around 3345 m(2)/g, and 2342 m(2)/g and CH4 storage of 174.10 cc/cc and 151 cc/cc, respectively. A comparison of the CH4 sorption of Tp-Azo and Tp-Azo-BD(Me)(2) COFs synthesized in different batches has a variation of only +/- 5 cc/cc and shows the consistency in bulk scale synthesis of COFs. The cyclic equilibrium CH4 adsorption studies showed the COFs are stable with consistent CH4 adsorption and desorption cycles. The present study is a step towards the scalable mechanochemical synthesis of COFs for gas storage applications.

10aCH4 storage10aCOF10aporous material10ascalable synthesis1 aAsokan, Kiran1 aPatil, Manoj, Krishnat1 aMukherjee, Shatabdi, Porel1 aSukumaran, Santhosh, Babu1 aNandakumar, T. uhttp://library.ncl.res.in/content/scalable-mechanochemical-synthesis-beta-ketoenamine-linked-covalent-organic-frameworks