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Prashant V. Kamat

Bio: Prashant V. Kamat is an academic researcher from University of Notre Dame. The author has contributed to research in topics: Racism & Excited state. The author has an hindex of 140, co-authored 725 publications receiving 79259 citations. Previous affiliations of Prashant V. Kamat include Indian Institute of Technology Kanpur & Council of Scientific and Industrial Research.


Papers
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TL;DR: The Editors, Staff, and Governance Members of ACS Publications condemn the tragic deaths of Black people and stand in solidarity with Black members of the science and engineering community, and condemns racism, discrimination, and harassment in all forms.
Abstract: We confront the terrible reality that systemic racism and discrimination impacts the daily personal and professional lives of many members of the scientific community and broader society In the US, the brutal killing of George Floyd while in police custody is one of the most recent examples of the centuries of systemic violence suffered by Black Americans This moment and its aftermath lay bare the legacies of racism and its exclusionary practices Let us be clear: we, the Editors, Staff, and Governance Members of ACS Publications condemn the tragic deaths of Black people and stand in solidarity with Black members of the science and engineering community Moreover, ACS condemns racism, discrimination, and harassment in all forms We will not tolerate practices and viewpoints that exclude or demean any member of our community Despite these good intentions, we recognize that our community has not done enough to provide an environment for Black chemists to thrive Rep Eddie Bernice Johnson, Chairwoman of the US House Committee on Science, Space, and Technology said, "So far, we have gotten by with a STEM workforce that does not come close to representing the diversity of our nation However, if we continue to leave behind so much of our nation's brainpower, we cannot succeed" 1 Indeed, the US National Science Foundation notes that Blacks and other under-represented minority groups continue to be under-represented in science and engineering education and employment 2 What is abundantly clear in this moment is that this lack of representation is a symptom of systemic racism across all levels of education and professional life We know that supportive words are not enough We must develop and implement a concrete plan for changing our trajectory Publications and citations are academic currency, and while we like to think publishing a manuscript is "just about the science", we know that is not true for everyone We have seen the biases (largely through the lens of gender and in Western countries because of the limitations in bibliometric analyses) and applaud our colleagues at the RSC for their massive study that explored these gender barriers in the publishing pipeline 3 and their recent Inclusion and Diversity Framework 4 At the present time, unfortunately, less is known about the effects of race and ethnicity on publishing success A study published in PeerJ, however, found that unprofessional reviewer comments had a disproportionate effect on authors from under-represented groups 5 As the world's leading society publisher, we have a responsibility to aggressively combat bias in all aspects of the publishing process, including systemic under-representation of Blacks in this endeavor (no ACS journal is currently led by a Black Editor-in-Chief) Within ACS Publications, we actively track gender and geographic diversity of editors, advisors, authors, and reviewers, and we anecdotally report on race of editors Diversity encompasses many more dimensions than these, and we acknowledge that we can do much more than we have We affirm that diversity and inclusion strengthen the research community and its impact, and we are committed to developing, implementing, tracking, and reporting on our progress to ensure that our editors, advisors, reviewers, and authors are more diverse and that all authors receive the same fair treatment and opportunity to publish in our journals We acknowledge that we do not have all the answers now, but we seek to hear from and listen to our community on how we can improve our journals to be more diverse and inclusive As first steps, we commit to the taking the following actions: • Gathering and making public our baseline statistics on diversity within our journals, encompassing our editors, advisors, reviewers, and authors; annually reporting on progress • Training new and existing editors to recognize and interrupt bias in peer review • Including diversity of journal contributors as an explicit measurement of Editor-in-Chief performance • Appointing an ombudsperson to serve as a liaison between Editors and our Community • Developing an actionable diversity plan for each ACS journal These are only initial plans and the start of a conversation: other ideas are beginning to germinate, and we commit to sharing them with you regularly We invite you contribute your ideas on how we can do better via our Axial website We are listening carefully We encourage you to take immediate action in your own circles In a recent editorial, JACS Associate Editor Melanie Sanford 6 offered practical steps to take now Take a moment to find out more about these actions and how to bring them into your work and your life We all have a responsibility to eradicate racism and discrimination in the science and engineering community; indeed, to make a real difference, we need to be antiracist The tragic events we have seen in the Black community provide great urgency to this goal The work will be difficult and will force us to confront hard realities about our beliefs and actions We fully expect that you, and everyone in the community, will hold us accountable

10 citations

Journal ArticleDOI
TL;DR: Proprietes de l'etat singulet et leetat triplet en solution caracterisees a l'ambiante et 77°K as mentioned in this paper.
Abstract: Proprietes de l'etat singulet et de l'etat triplet en solution caracterisees a l'ambiante et 77°K

10 citations

Journal ArticleDOI
TL;DR: In this paper, the ground-state dimerization was accompanied by an intensification and red-shift (from 370 to 401 nm) of the O-O absorption band and a large decrease in fluorescence quantum yield.
Abstract: Anthracene-2 sulfonate (2AS) molecules dimerized upon adsorption from aqueous solution onto positively charged alumina-coated silica particles (25-nm diameter). This ground-state dimerization was accompanied by an intensification and red-shift (from 370 to 401 nm) of the O-O absorption band and a large decrease in fluorescence quantum yield. Anthracene-1,5-disulfonate (1,5AS) and anthracene-1-sulfonate molecules also adsorbed to the particles but did not dimerize. Triplet states of the adsorbed molecules were characterized by laser flash photolysis. Direct photoexcitation of the 2AS dimer failed to produce an observable triplet state, but photosensitization yielded a triplet state of the dimer resembling that of the monomer. The triplet state of the adsorbed 1,5AS molecule was obtained by either direct or sensitized excitation. Binding capacities of the particles for 2AS and 1,5AS indicated that at maximal coverage the 2AS molecules were tilted with respect to the surface while the 1,5AS molecules were coplanar. Dimerization of 2AS occurred even when fewer than 1% of available adsorption sites were occupied.

10 citations

Journal ArticleDOI
TL;DR: In this paper, annealing in N2-annealed SiO2/CdSe/CuSCN extremely thin absorber (ETA) solar cells are found to give relatively high values of open-circuit voltage (> 0.8 V) but low currents upon anneal the cadmium selenide (CdSE) in air (500 oC).
Abstract: TiO2/CdSe/CuSCN extremely thin absorber (ETA) solar cells are found to give relatively high values of open-circuit voltage (>0.8 V) but low currents upon annealing the cadmium selenide (CdSe) in air (500 oC). Annealing in N2 produces much lower photovoltages and slightly lower photocurrents. Band structure measurements show differences between the two annealing regimes that, however, appear to favor the N2-annealed CdSe. On the other hand, chemically resolved electrical measurements (CREM) of the cells reveal marked differences in photo-induced charge trapping, in particular at absorber grain boundaries of the air versus N2-annealed systems, correlated with the formation of Cd–O species at the CdSe surface. Using transient absorption and photovoltage decay, pronounced lifetime differences are also observed, in agreement with the strong suppression of charge recombination. The results point to a multiple role of grain surface-oxidation, which both impedes electron injection from the CdSe to the TiO2, but, much more significantly, enhances hole injection to the CuSCN via passivation of hole traps that act as efficient recombination centers.

10 citations

Journal ArticleDOI
TL;DR: In this article, a photoelectrochemical polymerization of 1-vinylpyrene has been achieved in a semiconductor photocatalyst suspension under visible light irradiation (λ > 480 nm).
Abstract: Photoelectrochemical polymerization of 1-vinylpyrene has been achieved in a semiconductor photocatalyst suspension under visible light irradiation (λ > 480 nm). Bandgap excitation of CdS, CdSe or Fe2O3 led to the oxidation of 1-vinylpyrene, which initiated the polymerization process. A 25–47% yield of poly(1-vinylpyrene) could be obtained upon irradiation of these semiconductor photocatalyst suspensions with 1-vinylpyrene in acetonitrile. Dependence of the polymer yield on various experimental conditions is described.

10 citations


Cited by
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[...]

08 Dec 2001-BMJ
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality. Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

33,785 citations

Journal ArticleDOI
TL;DR: Two organolead halide perovskite nanocrystals were found to efficiently sensitize TiO(2) for visible-light conversion in photoelectrochemical cells, which exhibit strong band-gap absorptions as semiconductors.
Abstract: Two organolead halide perovskite nanocrystals, CH3NH3PbBr3 and CH3NH3PbI3, were found to efficiently sensitize TiO2 for visible-light conversion in photoelectrochemical cells. When self-assembled on mesoporous TiO2 films, the nanocrystalline perovskites exhibit strong band-gap absorptions as semiconductors. The CH3NH3PbI3-based photocell with spectral sensitivity of up to 800 nm yielded a solar energy conversion efficiency of 3.8%. The CH3NH3PbBr3-based cell showed a high photovoltage of 0.96 V with an external quantum conversion efficiency of 65%.

16,634 citations

Journal ArticleDOI
TL;DR: This work reviews the historical development of Transition metal dichalcogenides, methods for preparing atomically thin layers, their electronic and optical properties, and prospects for future advances in electronics and optoelectronics.
Abstract: Single-layer metal dichalcogenides are two-dimensional semiconductors that present strong potential for electronic and sensing applications complementary to that of graphene.

13,348 citations

Journal ArticleDOI
TL;DR: A review of gold nanoparticles can be found in this article, where the most stable metal nanoparticles, called gold colloids (AuNPs), have been used for catalysis and biology applications.
Abstract: Although gold is the subject of one of the most ancient themes of investigation in science, its renaissance now leads to an exponentially increasing number of publications, especially in the context of emerging nanoscience and nanotechnology with nanoparticles and self-assembled monolayers (SAMs). We will limit the present review to gold nanoparticles (AuNPs), also called gold colloids. AuNPs are the most stable metal nanoparticles, and they present fascinating aspects such as their assembly of multiple types involving materials science, the behavior of the individual particles, size-related electronic, magnetic and optical properties (quantum size effect), and their applications to catalysis and biology. Their promises are in these fields as well as in the bottom-up approach of nanotechnology, and they will be key materials and building block in the 21st century. Whereas the extraction of gold started in the 5th millennium B.C. near Varna (Bulgaria) and reached 10 tons per year in Egypt around 1200-1300 B.C. when the marvelous statue of Touthankamon was constructed, it is probable that “soluble” gold appeared around the 5th or 4th century B.C. in Egypt and China. In antiquity, materials were used in an ecological sense for both aesthetic and curative purposes. Colloidal gold was used to make ruby glass 293 Chem. Rev. 2004, 104, 293−346

11,752 citations

Journal ArticleDOI
Ryoji Asahi1, Takeshi Morikawa1, T. Ohwaki1, Koyu Aoki1, Y. Taga1 
13 Jul 2001-Science
TL;DR: Film and powders of TiO2-x Nx have revealed an improvement over titanium dioxide (TiO2) under visible light in optical absorption and photocatalytic activity such as photodegradations of methylene blue and gaseous acetaldehyde and hydrophilicity of the film surface.
Abstract: To use solar irradiation or interior lighting efficiently, we sought a photocatalyst with high reactivity under visible light. Films and powders of TiO 2- x N x have revealed an improvement over titanium dioxide (TiO 2 ) under visible light (wavelength 2 has proven to be indispensable for band-gap narrowing and photocatalytic activity, as assessed by first-principles calculations and x-ray photoemission spectroscopy.

11,402 citations