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Extreme Heat is the #1 weather related killer. That is why understanding its health impacts and developing innovative solutions to address it is SO…
Extreme Heat is the #1 weather related killer. That is why understanding its health impacts and developing innovative solutions to address it is SO…
Liked by Michael Campos
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We are hiring a part-time operations and adminstrative assistant to join our team! This is a great opportunity to help out in all sorts of ways at a…
We are hiring a part-time operations and adminstrative assistant to join our team! This is a great opportunity to help out in all sorts of ways at a…
Liked by Michael Campos
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It was wonderful attending the DOE's workshop on Catalyzing Next-Generation Geothermal. From a macro lens, geothermal (and other clean-firm tech)…
It was wonderful attending the DOE's workshop on Catalyzing Next-Generation Geothermal. From a macro lens, geothermal (and other clean-firm tech)…
Liked by Michael Campos
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Publications
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A Library of Selenourea Precursors to PbSe Nanocrystals with Size Distributions near the Homogeneous Limit
Journal of the American Chemical Society
We report a tunable library of N,N,N′-trisubstituted selenourea precursors and their reaction with lead oleate at 60–150 °C to form carboxylate-terminated PbSe nanocrystals in quantitative yields. Single exponential conversion kinetics can be tailored over 4 orders of magnitude by adjusting the selenourea structure. The wide range of conversion reactivity allows the extent of nucleation ([nanocrystal] = 4.6–56.7 μM) and the size following complete precursor conversion (d = 1.7–6.6 nm) to be…
We report a tunable library of N,N,N′-trisubstituted selenourea precursors and their reaction with lead oleate at 60–150 °C to form carboxylate-terminated PbSe nanocrystals in quantitative yields. Single exponential conversion kinetics can be tailored over 4 orders of magnitude by adjusting the selenourea structure. The wide range of conversion reactivity allows the extent of nucleation ([nanocrystal] = 4.6–56.7 μM) and the size following complete precursor conversion (d = 1.7–6.6 nm) to be controlled. Narrow size distributions (σ = 0.5–2%) are obtained whose spectral line widths are dominated (73–83%) by the intrinsic single particle spectral broadening, as observed using spectral hole burning measurements. The intrinsic broadening decreases with increasing size (fwhm = 320–65 meV, d = 1.6–4.4 nm) that derives from exciton fine structure and exciton–phonon coupling rather than broadening caused by the size distribution.
Other authorsSee publication -
Synthesis and Surface Chemistry of Cadmium Carboxylate Passivated CdTe Nanocrystals from Cadmium bis(Phenyltellurolate)
Chemistry of Materials
The surfaces of cadmium telluride (CdTe) crystal grains play an important, yet poorly understood role in CdTe solar cell efficiency. In order to study this issue, we have developed a scalable synthesis of colloidal CdTe nanocrystals from cadmium bis(phenyltellurolate) and cadmium carboxylate (Cd(O2CR)2) complexes. Using solution chemical techniques, we demonstrate that the binding of surface ligands to CdTe is particularly weak, enabling controlled study of solution-processed CdTe solar cells…
The surfaces of cadmium telluride (CdTe) crystal grains play an important, yet poorly understood role in CdTe solar cell efficiency. In order to study this issue, we have developed a scalable synthesis of colloidal CdTe nanocrystals from cadmium bis(phenyltellurolate) and cadmium carboxylate (Cd(O2CR)2) complexes. Using solution chemical techniques, we demonstrate that the binding of surface ligands to CdTe is particularly weak, enabling controlled study of solution-processed CdTe solar cells free from organic contaminants.
Other authorsSee publication -
A tunable library of substituted thiourea precursors to metal sulfide nanocrystals
Science
Controlling the size of colloidal nanocrystals is essential to optimizing their performance in optoelectronic devices, catalysis, and imaging applications. Traditional synthetic methods control size by terminating the growth, an approach that limits the reaction yield and causes batch-to-batch variability. Herein we report a library of thioureas whose substitution pattern tunes their conversion reactivity over more than five orders of magnitude and demonstrate that faster thiourea conversion…
Controlling the size of colloidal nanocrystals is essential to optimizing their performance in optoelectronic devices, catalysis, and imaging applications. Traditional synthetic methods control size by terminating the growth, an approach that limits the reaction yield and causes batch-to-batch variability. Herein we report a library of thioureas whose substitution pattern tunes their conversion reactivity over more than five orders of magnitude and demonstrate that faster thiourea conversion kinetics increases the extent of crystal nucleation. Tunable kinetics thereby allows the nanocrystal concentration to be adjusted and a desired crystal size to be prepared at full conversion. Controlled precursor reactivity and quantitative conversion improve the batch-to-batch consistency of the final nanocrystal size at industrially relevant reaction scales.
Featured in:
“Economical routes to colloidal nanocrystals” Science, 2015, 348, 1211-1212.
“New synthesis heralds low-cost quantum dots” Chemistry World, RSC, June 12th, 2015.Other authorsSee publication -
Quantifying accessible sites and reactivity on titania–silica (photo) catalysts: Refining TOF calculations
Journal of Catalysis
This study describes the effect of titanium precursor and surface density in determining the resulting oxide surface species. We also introduce a tool for determining the number of fluid-accessible Ti sites, and demonstrate the usefulness of the technique through a structure-insensitive photo-oxidation.
Other authorsSee publication
Patents
More activity by Michael
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In my latest for Green Building Advisor, I profiled a noteworthy climate tech startup based in the famous Greentown Labs in Somerville, MA. 2023 was…
In my latest for Green Building Advisor, I profiled a noteworthy climate tech startup based in the famous Greentown Labs in Somerville, MA. 2023 was…
Liked by Michael Campos
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You know you've reached the promised land in air conditioning when architects, building engineers and general contractors understand your systems and…
You know you've reached the promised land in air conditioning when architects, building engineers and general contractors understand your systems and…
Liked by Michael Campos
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📰 Regulatory Policy News!🔋 Yesterday the California Public Utilities Commission approved a new series of clean energy procurement mandates to meet…
📰 Regulatory Policy News!🔋 Yesterday the California Public Utilities Commission approved a new series of clean energy procurement mandates to meet…
Liked by Michael Campos
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As we approach November 5th, a time often dominated by partisan messaging, I’d like to offer a different perspective. Geothermal energy continues to…
As we approach November 5th, a time often dominated by partisan messaging, I’d like to offer a different perspective. Geothermal energy continues to…
Liked by Michael Campos
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At AtmosZero we’re assembling the best team in the world to help customers decarbonize their boiler and steam systems. And today we are welcoming one…
At AtmosZero we’re assembling the best team in the world to help customers decarbonize their boiler and steam systems. And today we are welcoming one…
Liked by Michael Campos
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Hello energy people. You might find my op-ed in today’s The New York Times on grid reliability to be of interest. CC: Webber Energy Group…
Hello energy people. You might find my op-ed in today’s The New York Times on grid reliability to be of interest. CC: Webber Energy Group…
Liked by Michael Campos
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If only we could avoid sending the vast majority of mined copper to be smelted in China... Enter Ceibo https://lnkd.in/g3Zb84Ci
If only we could avoid sending the vast majority of mined copper to be smelted in China... Enter Ceibo https://lnkd.in/g3Zb84Ci
Liked by Michael Campos
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Excited to share that Circe has been awarded a fixed-price contract with DARPA! Our project is part of the Cornucopia project, started by Molly…
Excited to share that Circe has been awarded a fixed-price contract with DARPA! Our project is part of the Cornucopia project, started by Molly…
Liked by Michael Campos
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"'It’s not the heat that gets you, it’s the humidity,' said a dad, somewhere." https://lnkd.in/e3yGpZ-N Transaera, Inc. Sorin Grama Ross Bonner…
"'It’s not the heat that gets you, it’s the humidity,' said a dad, somewhere." https://lnkd.in/e3yGpZ-N Transaera, Inc. Sorin Grama Ross Bonner…
Shared by Michael Campos
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In short: I graduated my MBA from Stanford University Graduate School of Business! I'll still be in California finishing up my MS at Stanford Doerr…
In short: I graduated my MBA from Stanford University Graduate School of Business! I'll still be in California finishing up my MS at Stanford Doerr…
Liked by Michael Campos
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Check out this new paper published by Terragia CTO & co-founder Lee Lynd, plus co-authors, which turns the biofuel “fuel vs. food” debate on its…
Check out this new paper published by Terragia CTO & co-founder Lee Lynd, plus co-authors, which turns the biofuel “fuel vs. food” debate on its…
Liked by Michael Campos
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