Daniel Cruz

Daniel Cruz
Fritz Haber Institute of the Max Planck Society | FHI · Department of Inorganic Chemistry

Dr.rer.nat.

About

46
Publications
12,039
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
612
Citations
Additional affiliations
June 2020 - present
Fritz Haber Institute of the Max Planck Society
Position
  • Research Associate Synchrotron BESSY II
May 2020 - present
Max Planck Institute for Chemical Energy Conversion
Position
  • Research Associate
August 2016 - August 2019
Max Planck Institute of Colloids and Interfaces
Position
  • PhD Student
Education
August 2016 - December 2019
Max Planck Institute of Colloids and Interfaces
Field of study
  • Materials Chemistry for Solar Cells
February 2013 - November 2014
Autonomous University of Nuevo León
Field of study
  • CZTS based thin film solar cells
September 2007 - November 2012
National University of Colombia
Field of study
  • Chemistry

Publications

Publications (46)
Article
Full-text available
ZnS thin films were deposited by CBD (chemical bath deposition) method using a solution containing thiourea and zinc acetate as sources of S and Zn and ammonium citrate as complexing agent. The samples were grown on soda lime glass substrates covered with a Cu2SnZnS4 (CZTS) thin film. Through an extensive parameter study carried out varying the mai...
Article
Full-text available
Any-Particle Molecular Orbital/Hartree-Fock (APMO/HF) calculations are performed for a variety of atoms and simple diatomic molecular systems containing one and two negative muons (μ). In these calculations electrons and muons are described quantum mechanically whereas nuclei are treated as point charges. Our results for atoms containing n=1,2 nega...
Preprint
Full-text available
Novel high performing materials will dictate the pace of reinventing industrial chemical processes to attain desired carbon neutrality targets. Regarding the urgency of exploiting solar irradiation long range visible-light photoelectrocatalysts from abundant resources will play a key role in the aforementioned effort. Anionic doping via co-polymeri...
Preprint
Full-text available
Novel high performing materials will dictate the pace of reinventing industrial chemical processes to attain desired carbon neutrality targets. Regarding the urgency of exploiting solar irradiation long range visible-light photoelectrocatalysts from abundant resources will play a key role in the aforementioned effort. Anionic doping via co-polymeri...
Poster
Full-text available
This work contributes to the development of amorphous sulfur-doped carbon nitride photoelectrocatalysts with long-visible-light range for solar energy conversion and storage.
Article
The requirements for organic semiconductor materials and new methods for their synthesis at low temperature have risen over the last decades, especially due to concerns of sustainability. Herein, the synthesis of a carbon/oxygen molecular semiconductor thin film, which is promptly reactive toward amines, is presented. This allows for tuning the sem...
Preprint
Nitrogen-doped carbons (NC) are a class of sustainable materials for selective CO2 adsorption. We introduce a versatile concept to fabricate flexible NC-based sensor architectures for room-temperature sensing of CO2 in a one-step laser conversion of primary coatings cast from abundant precursors. By the unidirectional energy impact in conjunction w...
Article
Full-text available
Chromoselective photocatalysis offers an intriguing opportunity to enable a specific reaction pathway out of a potentially possible multiplicity for a given substrate by using a sensitizer that converts the energy of incident photon into the redox potential of the corresponding magnitude. Several sensitizers possessing different discrete redox pote...
Article
Polymer brushes on surfaces enable advanced material design. In the present contribution, transparent and flat photoactive polymeric carbon nitride (pCN) thin films are employed as a photoactive substrate and primer layer to grow polystyrene (PS) brushes. These films are then characterized by ellipsometry. For the first time herein is reported on t...
Preprint
Full-text available
The requirements for organic semiconductor materials and new methods for their synthesis at low temperature have risen over the last decades, especially due to concerns of sustainability. Herein, we present an innovative method for the synthesis of a so-called “red carbon” thin film, being composed of carbon and oxygen, only. This material was alre...
Article
Full-text available
Carbon laser‐patterning (CLaP) is emerging as a new tool for the precise and selective synthesis of functional carbon‐based materials for on‐chip applications. The aim of this work is to demonstrate the applicability of laser‐patterned nitrogen‐doped carbon (LP‐NC) for resistive gas‐sensing applications. Films of pre‐carbonized organic nanoparticle...
Article
Full-text available
Perovskites are interesting oxidation catalysts due to their chemical flexibility enabling the tuning of several properties. In this work, we synthesized LaFe 1-x Co x O 3 catalysts by co-precipitation and thermal decomposition, characterized them thoroughly and studied their 2-propanol oxidation activity under dry and wet conditions to bridge the...
Article
Full-text available
Ternary materials made up only from the lightweight elements boron, carbon, and nitrogen are very attractive due to their tunable properties that can be obtained by changing the relative elemental composition. However, most of the times, the synthesis requires to use up to three different precursor and very high temperatures for the synthesis. More...
Article
Full-text available
Potassium poly (heptazine imide) (K-PHI), a crystalline two-dimensional carbon–nitride material, is an active photocatalyst for water splitting. The potassium ions in K-PHI can be exchanged with other ions to change the properties of the material and eventually to design the catalysts. We report here the electronic structures of several ion-exchang...
Article
Approaches to boost the efficiency and stability of perovskite solar cells often address one singular problem in a specific device configuration. In this work, we utilize a poly(ionic-liquid) (PIL) to...
Article
Full-text available
Because of their peculiar nitrogen-rich structure, carbon nitrides are convenient polydentate ligands for designing single atom-dispersed photocatalysts. However, the relation between catalysts’ textural properties and their photophysical–photocatalytic properties is rarely elaborated. Herein, we report the preparation and characterization of a ser...
Article
Full-text available
Acetic anhydride (AA) is usually considered a stable molecule but is shown here to be able to polymerize in closed reactors to a cross-linked polyketone condensate. By using this chemistry, it was possible to copolymerize AA with L-histidine, which gives a nitrogen-doped functional nanoporous polymer that can act as an acid−base heterogeneous catal...
Preprint
Because of their peculiar nitrogen-rich structure, carbon nitrides are convenient polydentate ligands for designing single-atom-dispersed photocatalysts. However, the relation of catalysts textural properties with their photophysical properties and as a result activity in photocatalytic applications is rarely elaborated. Herein we report the prepar...
Article
Full-text available
We present an innovative method for the synthesis of boron carbon nitride thin film materials in a simple furnace setup, using commonly available solid precursors and relatively low temperature compared to previous attempts. The as-prepared structural and optical properties of thin films are tuned via the precursor content, leading to a sp²-conjuga...
Article
Deposition of stable single atoms on supports is a hot topic, especially for catalysis, and single atom deposition in nitrogen-framed pores of carbon and carbon nitrides is indeed the most successful. The polymeric semiconductor graphitic carbon nitride (g-CN) is an exciting scaffold due to its nitrogen-rich structure (C3N4 ideally) and the inheren...
Thesis
Carbon nitride and poly(ionic liquid)s (PILs) have been successfully applied in various fields of materials science owing to their outstanding properties. This thesis aims at the successful application of these polymers as innovative materials in the interfaces of hybrid organic–inorganic perovskite solar cells. A critical problem in harnessing the...
Article
Full-text available
Brilliance usually refers to the light reflected by the facets of a gemstone such as diamond due to its high refractive index. Nowadays, high‐refractive‐index materials find application in many optical and photonic devices and are mostly of inorganic nature. However, these materials are usually obtained by toxic or expensive production processes. H...
Article
Full-text available
The Front Cover shows a sustainable continuous‐flow process for upgrading lignocellulosic‐biomass‐derived γ‐valerolactone to α‐methylene‐γ‐valerolactone by utilizing a tailored Cs‐loaded hierarchical beta catalyst. This work provides an alternative route in the GVL biorefinery towards bio‐based polymer. More information can be found in the Full Pap...
Article
Cross‐coupling reactions via dual nickel/photo‐catalysis are synthetically attractive but rely mainly on expensive, non‐recyclable noble metal complexes as photocatalysts. Heterogeneous semiconductors, commonly used for artificial photosynthesis and wastewater treatment, are a sustainable alternative. Graphitic carbon nitrides, a class of metal‐fre...
Article
Cross‐coupling reactions via dual nickel/photo‐catalysis are synthetically attractive but rely mainly on expensive, non‐recyclable noble metal complexes as photocatalysts. Heterogeneous semiconductors, commonly used for artificial photosynthesis and wastewater treatment, are a sustainable alternative. Graphitic carbon nitrides, a class of metal‐fre...
Article
The necessity of more sustainable products and processes has led to the use of new methodologies which result in a low carbon footprint. Here, we demonstrated an efficient tandem process for the liquid‐phase catalytic upgrading of lignocellulosic biomass‐derived Υ‐valerolactone (GVL) with trioxane (Tx) to α‐methylene‐Υ‐valerolactone (MeGVL) in flow...
Article
Full-text available
The original version of this Article contained errors in Figure 3. In Fig. 3d, the label ‘With light irradiation’ was originally incorrectly given as ‘Without light irradiation’. In Fig. 3f, the label ‘Without light irradiation’ was originally incorrectly given as ‘With light irradiation’. This has been corrected in both the PDF and HTML versions o...
Article
Full-text available
Biological light-driven ion pumps move ions against a concentration gradient to create a membrane potential, thus converting sunlight energy directly into an osmotic potential. Here, we describe an artificial light-driven ion pump system in which a carbon nitride nanotube membrane can drive ions thermodynamically uphill against an up to 5000-fold c...
Article
Covalent modification of phenyl modified carbon nitride with vinylthiazole groups via visible light induced grafting is reported. Modified structures express negative charge migration to the thiazole edges while the carbon nitride sheet remains positively charged in organic solutions. Such a phenomenon provides electrostatic stabilization of modifi...
Conference Paper
Metal halide perovskite solar cells are now effectively competing with their inorganic counterparts in terms of power conversion efficiencies. However, state of the art perovskite solar cells still suffer from limited fill factor (FF) and open circuit voltage (Voc), which has been related to non-geminate losses mostly happening at the surface of th...
Article
A new photocatalytic reaction process is described that cyano groups (–CN) are successfully grafted on carbon nitride (g-C3N4 materials). The cyano group substitutes the previous surface terminating amino group (–NH2) on g-C3N4 by a radical reaction pathway, modifying the electron structure of the conjugated covalent system and engendering favorabl...
Conference Paper
Full-text available
This work describes novel procedures to grow Cu2ZnSnS4 (CZTS) thin films using vacuum and solution based methods. The solution based approach includes sequential deposition of Cu2SnS3 (CTS) and ZnS films, where the CTS compound is synthesized in a one step process by simultaneous precipitation of Cu2S and SnS2 in a thiosulphate solution, using diff...
Article
Full-text available
A comparative study of the structural, optical and morphological properties of Cu2ZnSnS4 (CZTS) thin films prepared by two different techniques was performed. One consists of sequential evaporation of the elemental metallic precursors under a flux of sulphur supplied by evaporation from an effusion cell (physical vapor deposition-PVD) and the se...
Conference Paper
Full-text available
Optical and structural properties, chemical composition and oxidation states of Cu2ZnSnS4 (CZTS) thin films prepared by co-evaporation are compared with those of CZTS films grown by sequential deposition of Cu2SnS3 (CTS) and ZnS thin films, where the CTS compound is prepared in one step process by simultaneous precipitation of Cu2S and SnS2 perform...
Conference Paper
This work describes an experimental study of a Cu2ZnSnS4 (CZTS) single phase thin films and powders. The new synthesis method yielded a significant amount of this compound in few minutes (around 3 min) and the growth is based on a layer by layer from a solution of nanocrystal inks and a fast heating by the use of microwaves. The size, structural an...
Conference Paper
Full-text available
This work describes a procedures to grow single phase Cu2ZnSnS4 (CZTS) thin films with tetragonal-kesterite type structure, using solution and vacuum based deposition techniques. The solution based deposition approach involves sequential deposition of Cu2SnS3 (CTS) and ZnS films, where the CTS compound is synthesized in one step process by sim...
Article
Full-text available
This work describes a procedures to grow single phase Cu2ZnSnS4 (CZTS) thin films with tetragonal-kesterite type structure, using solution and vacuum based deposition techniques. The solution based deposition approach involves sequential deposition of Cu2SnS3 (CTS) and ZnS films, where the CTS compound is synthesized in one step process by simultan...
Article
Full-text available
span style="font-family: LMRoman9-Regular; font-size: xx-small;"> Películas delgadas de ZnS fueron sintetizadas por el método CBD (Chemical bath deposition) usando una solución constituida por tiourea y acetato de zinc como fuentes de S y Zn y citrato de amonio como agente acomplejante. Estas fueron crecidas sobre sustratos de vidrio soda lime rec...
Article
Full-text available
This paper present a new method for growing thin films of CZTS using a solution-based chemical route; this consist in sequential deposition of Cu2-xS, SnS and ZnS films by CBD followed by annealing in nitrogen atmosphere. The Cu2-xS and SnS precursors were deposited by diffusion membranes assisted CBD technique and the ZnS by conventional CBD metho...
Article
Full-text available
a b s t r a c t In this Letter we present a theoretical study of atoms in which one electron has been replaced by a neg-ative muon. We have treated these muonic systems with the Any Particle Molecular Orbital (APMO) method. A comparison between the electronic and muonic radial distributions revealed that muons are much more localized than electrons...