Malik Dilshad Khan

Phase-pure fabrication and shape evolution studies of SnS nanosheets

Phase pure SnS nanosheets were synthesized by a hot injection method from a new single molecular precursor (SMP), dibutyl-bis(piperidinedithiocarbamato)tin(IV) in oleylamine at 230 °C. The tin complex was characterized by single crystal X-ray crystallography, nuclear magnetic resonance, thermogravimetry and microelemental analysis. The complex is thermally stable up to 260 °C, after which it decomposes in a single step with a major mass loss between 260 °C and 300 °C. The thermolysis of the as-prepared precursor was carried out in oleylamine between 190 and 230 °C. The formation and shape evolution of SnS was investigated using high resolution electron microscopy. The mechanism of the time dependent growth of SnS from spherical particles into nanosheets is proposed.

Effect of surfactants on the morphology of FeSe films fabricated from a single source precursor by aerosol assisted chemical vapour deposition

AbstractThis article presents the fabrication of FeSe thin films from a single source precursor namely (1-(2-fluorobenzoyl)-3-(4-ferrocenyl-3-methylphenyl)selenourea (MeP2F)) by aerosol assisted chemical vapour deposition (AACVD). All the films were prepared via similar experimental conditions (temperature, flow rate, concentration, solvent system and reactor type) except the use of three different concentrations of two different surfactants i.e., triton and span. Seven thin films were characterized with PXRD, SEM, AFM, EDS and EDS mapping. The mechanism of the interaction of surfactant with MeP2F was determined with cyclic voltammetry (CV) and UV-Vis spectroscopy. Graphical AbstractMorphological studies of FeSe thin films fabricated from a single source ferrocene-incorporated selenourea precursor under the influence of two surfactants viz., triton and span are presented.

Aerosol-Assisted Chemical Vapour Deposition for Iron Selenide Thin Films from Single Source Ferrocene-Incorporated Selenourea Precursor in the Presence of Surfactants

This article presents the synthesis and characterisation (Fourier transform infrared spectroscopy, 1H NMR and 13C NMR spectroscopy, CHNS (carbon, hydrogen, nitrogen, sulfur) analysis, atomic absorption spectrometry, and single-crystal X-ray diffraction) of a single source molecular precursor 1-(2-fluorolbenzoyl)-3-(3-ferrocenylphenyl)selenourea (M2F). This precursor has been used for the fabrication of FeSe thin films by aerosol-assisted chemical vapour deposition (AACVD) in the presence of different concentrations of two different surfactants (triton and span) keeping all other conditions the same. Fabricated thin films have been characterised with powder X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The interaction of the surfactants with the precursor (M2F) has been evaluated with cyclic voltammetry and UV–vis spectroscopy.

Bis(selenobenzoato)dibutyltin(IV) as a single source precursor for the synthesis of SnSe nanosheets and their photo-electrochemical study for water splitting

A new organo-tin complex has been synthesized and used as a single source precursor for the synthesis of SnSe nanosheets by the hot injection method and thin films by the aerosol assisted chemical vapor deposition (AACVD) method. The films were deposited on glass substrates at three different temperatures. The textural quality and preferential growth were found to be significantly altered by changes in the deposition temperature. Oleylamine capped nanosheets and the as-deposited thin films by AACVD were characterized by powder X-ray diffraction (p-XRD) and microscopic techniques. The thin films were also studied by Raman spectroscopy. The stoichiometry is marginally affected by temperature, and all films were slightly selenium deficient. The synthesized material was also evaluated for the photoelectrochemical (PEC) splitting of water. The PEC study revealed the bifunctional nature of the material, which can be applied for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), by switching the applied potential.

Cesium Lead Halide Perovskite Nanostructures: Tunable Morphology and Halide Composition

Inorganic halide perovskite (CsPbX3 ) nanostructures have gained considerable interest in recent years owing to their enhanced stability and optoelectronic applications. Recent developments in the synthesis of nanostructures are reviewed. The impact of the precursor and ligand nature, temperature and growth time on the morphology and shape tuning of CsPbX3 nanostructures is described in relation to their optical properties. The presynthetic and postsynthetic anion exchange strategies to retain pre-existing crystal phase and shape are discussed in this minireview.

Effect of cationic disorder on the energy generation and energy storage applications of NixCo3−xS4 thiospinel

Thiospinels show interesting catalytic and energy storage applications, however, the cationic disorder can have major influence on the energy generation and/or energy storage applications. In this study, the effect of stoichiometric variation of metals in a thiospinel i.e. NixCo3−xS4, is examined on energy generation and storage properties. Nickel- or cobalt-rich NixCo3−xS4 nanosheets were prepared by the hot injection method using single molecular precursors. The nanosheets were characterized by p-XRD, TEM, HR-TEM, EDX and XPS techniques. Nickel-rich and cobalt-rich nanosheets were tested for oxygen and hydrogen evolution reactions and for supercapacitance performance. It was observed that the nickel-rich NixCo3−xS4 nanosheets have superior energy storage and energy generation properties.

Broadband emission in a new lead free all-inorganic 3D CsZnCl2I perovskite

This contribution reports the deposition of new zinc based lead free all inorganic 3D CsZnCl2I perovskite thin films using aerosol assisted chemical vapour deposition (AACVD) at 100 °C. Room tempertaure optical measurements performed on the as-deposited thin films showed two absorption peaks. Upon 325 nm excitation, the CsZnCl2I perovskite thin film showed broad band white light emission having two peaks, which cover the entire visible range of the spectrum. This is the first example of white light emission from 3D all-inorganic lead free mixed halide CsZnCl2I perovskites.

Facile synthesis of a PbS1−xSex (0 ≤ x ≤ 1) solid solution using bis(N,N-diethyl-N′-naphthoylchalcogenoureato)lead(II) complexes

A nanocrystalline PbS1−xSex (where 0 ≤ x ≤ 1) solid solution has been synthesized over the entire range of composition using bis(N,N-diethyl-N′-naphthoyl thio- (1) and seleno- (2) ureato) complexes of lead, via the hot injection route. The p-XRD analysis of the PbS1−xSex series shows that the diffraction peaks of the alloy system is intermediate between pure PbS and PbSe. The alloyed nanoparticles displayed cubic morphologies similar to the parent materials. The absorption band gap for the alloyed system showed a linear shift from PbS to PbSe as a function of composition and is related to the change in the lattice parameters.