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22 protocols using lead 2 chloride

1

Synthesis and Characterization of Lead Halide Perovskites

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Cesium carbonate (Cs2CO3, 99%), lead(II)
chloride (PbCl2, 98% trace metals basis),
lead(II) bromide (PbBr2, 99.999% trace metal basis), lead(II)
iodide (PbI2, 99.999% trace metal basis), ammonium thiocyanate
(ATCN, 97.5%), oleylamine (OLAM, 98%), oleic acid (OA, 90%), 1-octadecene
(ODE, 90%), and toluene (TOL, anhydrous, 99.8%) were purchased from
Sigma-Aldrich. All chemicals were used as received, without any further
purification.
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2

Synthesis and Modification of Gold Gratings

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Acetic acid (reagent grade, ≥99%), diethyl ether (≥99.7%), 4-ethynylaniline (97.0%), p-toluenesulfonic acid monohydrate (ACS reagent, ≥98.5%), mercaptosuccinic acid (≥99.0%), cobalt(II) chloride hexahydrate (reagent grade), copper(II) chloride (99%), cadmium chloride hydrate (99.995% trace metals basis), lead(II) chloride (99.999%), mercury(II) chloride (reagent grade, 99%), aluminum nitrate nonahydrate (99.997%), zinc chloride (99.999%), chromium(II) chloride (95%), high-purity water (EMD MILLIPORE), and methanol (≥99.8%) were purchased from Sigma-Aldrich and used without further purification. Gold gratings were prepared according to a published procedure [29 (link)], as shown in Figure S1 (Supplementary Information), 4-ethynylbenzenediazonium tosylate (ADT-C≡CH) was prepared according to [42 (link)], and the modification procedure was conducted according to [43 (link)].
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3

Perovskite Solar Cell Fabrication

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Fluorine-doped Tin Oxide (FTO, surface resistivity of 10 Ω/square), Methylammonium Iodide (MAI, 98%), Lead (II) Chloride (98%), N,N-Dimethylformamide, (DMF, Anhydrous 99.8%), 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene, spiro-OMeTAD (99%), Chlorobenzene (Anhydrous 99.8%), Bis(trifluoromethane) sulfonamide lithium salt (Li-TFSI, 99.95%), 4-tert-Butylpyridine (96%), Acetonitrile (99.8%), Cuprous Iodide (CuI, 98%), Titanium di-isopropoxide bis (acetylacetonate) 75% (w/w), Ethanol (absolute, for HPLC, ≥99.8%) and poly(3-hexylthiophene-2,5-diyl) were purchased from Sigma-Aldrich (Oslo, Norway). 18NR-T Transparent Titania Paste was purchased from Great Cell Solar (Queanbeyan, Australia). All solvents were used without any further purification.
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4

Synthesis of Metal Nanoparticles

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Gold(III) chloride trihydrate (HAuCl4∙3H2O, 99.9%), trisodium citrate, sodium borohydride (NaBH4, 99%), hexadecyltrimethyl ammonium chloride (CTAC, 25 wt% solution in water), hexadecyltrimethyl ammonium bromide (CTAB, 99%), potassium bromide (KBr, 99%), potassium iodide (KI, 99%), L-ascorbic acid (99%), lead(II) chloride (PbCl2, 99.9%), and sodium thiosulfate (Na2S2O3, 99%) were purchased from Sigma-Aldrich (St. Louis, MO, USA). 2-Mercapto ethanol was obtained from Merck (Darmstadt, Germany). Deionized water was used throughout whole experiments.
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5

Synthesis of Methylammonium Iodide Perovskite

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Methylammonium iodide (MAI) was synthesized using a methylamine solution (33 wt % in ethanol) and hydroiodic acid (57 wt % in water). First, methylamine was stirred using a dropwise addition of hydroiodic acid in an ice bath for 2 h. The solvent was evaporated by a rotary evaporator, and then the mixture was solvated in ethanol. After recrystallization with diethyl ether, the white solid was precipitated and then dried under a vacuum for 24 h. The perovskite solution was prepared with MAI and lead (II) chloride (99.999%, Sigma-Aldrich, St. Louis, MO, USA) at a 3:1 molar ratio, 45 wt %, in N,N-dimethylformamide (DMF).
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6

Synthesis of Metal-Chitosan Composites

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All chemicals are fine products. Lead (II) chloride (98%) and cadmium (II) chloride (anhydrous, 99.999%) salts (i.e., CdCl2 and PbCl2, for the synthetic solution), Chitosan (with 90.5% deacetylation degree), glutaraldehyde (50 wt.% in H2O), and alginate were supplied from Sigma-Aldrich, (Merck, Darmstadt, Germany). Magnesium chloride hexahydrate (≥98.0%), sodium chloride (≥99.5%), and aluminum chloride anhydrous (99.999%) were purchased from Guangdong Sci-Tech Co., Ltd., (Guangzhou, China). A stock solution of 1000 ppm was prepared for each element and a freshly diluted solution was prepared by deionized water to the desired concentration of the experiment. All other reagents are the Prolabo products—Morillons, France.
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7

Colloidal Synthesis of Lead Halide Perovskites

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1-Octadecene (ODE, tech, 90%), oleic acid
(OA, tech, 90%), oleylamine (OLA, tech, 70%), lead(II) bromide (PbBr2, 98%), lead(II) chloride (PbCl2, 98%), lead(II)
iodide (PbI2, 98%), cesium carbonate (Cs2CO3, 99%), dodecanethiol (DDT, 99.9%), sulfur powder (S, 99.99%),
and lead acetate trihydrate (Pb(OAc)2·3H2O, 99.99%), were purchased from Sigma-Aldrich. All reagents were
used as received without any further experimental purification.
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8

Synthesis of Perovskite Nanocrystals

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All the reagents were used without any purification. Cesium carbonate (Cs2CO3, 99.999% Kojundo), lead (II) bromide (PbBr2, 99%, Sigma-Aldrich), lead (II) chloride (PbCl2, 98%, Sigma-Aldrich), manganese (II) bromide (MnBr2, 98%, Sigma-Aldrich) manganese (II) chloride tetrahydrate (MnCl2.4H2O, 99%, Sigma-Aldrich), oleic acid (OA, 90%, Fluka), octylamine (OcA, 97%, Sigma-Aldrich), N,N-dimethylformamide (DMF, 99.8%, Sigma-Aldrich), n-hexane (99.8%, Junsei, Japan), n-octane (90%, Sigma-Aldrich), 1-octadecene (95%, Sigma-Aldrich), hydrochloric acid (37%, Sigma-Aldrich), and hydrobromic acid (48%, Sigma-Aldrich) were employed for the synthesis.
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9

Synthesis of Graphene Oxide from Chitosan

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Low molecular weight chitosan (MW of 190 kDa and deacetylation degree of 75–85%), phosphorus pentoxide, potassium peroxydisulfate and lead(II) chloride 99.999% were acquired from Sigma–Aldrich (Steinheim, Germany). Graphite (natural powder), potassium permanganate (Lach–Ner, Neratovice, Czech Republic), glacial acetic acid (Chimreactiv, Bucharest, Romania), sulphuric acid 95%–97% and ethylenediaminetetraacetic acid (EDTA) were from Merck (Darmstadt, Germany). Hydrogen peroxide 35% and hydrochloric acid were from Silal Trading (Bucharest, Romania).
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10

Synthesis of Colloidal Nanocrystals

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Lead acetate trihydrate (99.99%, Sigma-Aldrich), oleic acid (90%,
Sigma-Aldrich), 1-octadecene (90%, Sigma-Aldrich), selenium powder
(99.99%, Alfa Aesar), trioctylphosphine (90%, Sigma-Aldrich), diphenylphospine
(98%, Sigma-Aldrich), 1-butanol (99.8% anhydrous, Sigma-Aldrich),
methanol (99.8% anhydrous, Sigma-Aldrich), toluene (99.8% anhydrous,
Sigma-Aldrich), ethylene glycol (99.8%,anhydrous, Sigma-Aldrich),
acetonitrile (99.8%, anhydrous, Sigma-Aldrich), lithium perchlorate
(99.99%, Sigma-Aldrich), and lead(II) chloride (99.99%, Sigma-Aldrich).
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